关于微笑主题英语演讲稿
关于微笑主题英语演讲稿(精选26篇)
关于微笑主题英语演讲稿1
Smile, and sometimes can be a life to retain power.
"To retain the life of laughter," tells the story of a place in the true story of the war years, in the story, a huge smile to show her magic.
War, a number of German soldiers found guilty of a terrible mistake had been closed to general, including one soldier in particular would like to go out alive, but this possibility is too remote. He was informed of his life in the death of the ultimatum had been issued - and three months would be shot, so he does not pin any hope on the survival of the. Two weeks later, he calmed down. He visited every day to face the smiling general, the generals began to ignore him, then, he has a little goodwill, and began to talk to him ... ... three months after the date on the blink of an eye later, shot By the time this is a very strange shot: General cite shot on the left hand, right hand to give back to the team that can be a continuation of the war. His turn, he closed his eyes, waiting for death to come, this time, his generals to see, he slowly raised his right hand ... ...
This is the life-saving force, which is hard to imagine the magic! Every day to a general apology to smile, even from its own bottom line back to the original point of death, this not the great power of a smile?
If we are able to smile in the face of every person and every thing, the success or failure of honor in the face with a smile, a smile in the face of all with a smile of genuine spiritual insights better life, it would be very happy and well-being.
Jan-mouth, will be able to draw a beautiful arc, which is how simple things! However, we do every day to add a smile to my soul? Did not - did not test test, simply Poguanposhuai; job search is unsuccessful, they feel depressed; to buy lottery tickets with the first prize was only a figure on the stomp beat their chests ... ...
Strictly speaking, these trivial little too! But sometimes we do these things to worry all day, affecting many of the stem.
Smile is a force used to be a smile, a smile used to the things people will not be led by the nose, facial expression is not just a smile or a state of mind, it should be a smile from the heart. The story of the soldiers that if only the blunt expression, that the general will be more than just a pleasing.
So smile is a positive state of mind, you have a smile on other people, other people will also answer your smile.
Smile is in the hearts of the Yi Shuguang, the hearts of bright, full of hope.
Smile is embedded in the heart of love, the magic of love.
In the face of your life with a smile! We find that the world is so beautiful.
关于微笑主题英语演讲稿2
There is a kindness called smile Good afternoon, ladies and gentlemen!
Today I’d like to share my personal experience of happiness and bitterness of being an English teacher. I remember, five years ago, when I stood at the teacher’s desk for the first time, maybe because I was too young, maybe because I was too inexperienced, the students in my class paid no attention to me, didn’t behave themselves at all. I felt ashamed and helpless.
In order to save my face, I just criticized the students seriously whenever they talked in class or even moved a little. I thought sooner or later, they would listen to me.
Yes, I could control the class now, but the students and the atmosphere became strange. No, they were not listening to me. It was too quiet. The breathless silence urged me to consider the way I was teaching.
Then 1 August 20xx, I got the chance to study the New Course of English. Until then could I realized that it was my frozen eyes that make the students flinch, it was my stiff face that trod out the enthusiasm in the children’s hearts. How to stimulate my class and show my warmth, so that they can enjoy their study in English? I had a deep thought.
It’s smile. There is a kindness called smile. It is the most beautiful language in the world. It can make distance no distance. “Just awake the students with a smiling face!”I said to myself. The next day, when I stood on the stage with a smiling face, when I asked the questions with a smile, when I encouraged the children in a friendly way, the students were just shocked!
But I could find there was more happiness and excitement in their eyes!
Gradually, they got used to it, and participated in my teaching. As I predicted, that class became a lovely one. I was moved, and said“Thank you for listening, boys and girls!”
In the following days, I keep on working even harder. I prepare my lessons carefully. I use Flash, pictures, riddles, and interesting stories to make great efforts to help the students to learn more. But I will never forget one thing: smile, give them a smile, to give them strength, to let them feel happy, to make them confident. The children do enjoy the English lesson now, when they tell me the answers in great excitement, I can feel their gladness, and my smile is more sincerely than ever!
There is kindness called smile. From the children’s yearning eyes, I understand, it is smile that makes my students and I get closer, it is smile that fills the kindness to my English class, it is smile that shapes me popular English teacher finally. That’s all. Thank you very much!
关于微笑主题英语演讲稿3
So many people underestimate the power and importance of a smile, that simple little facial expression characterized by an upward curving of the corners of the mouth.
A smile has many meanings: pleasure, friendliness, welcome, amusement, and many more; and it is part of a universal body language that doesn’t need any extra interpretation.
Plus a smile, with all its simplcity and beauty, can be a very important factor in many aspects of our lives:
You fall in love with a new country you visit because its people greet you with a welcoming smile everywhere you go; other countries you just don’t like even though they might have more history, nature, entertainment and whatnot because their people don’t seem so friendly or accepting.
You feel like buying from a certain store when the vendor welcomes you in with a smile, sometimes even if you wouldn’t intially have bought anything; and in other stores, even though they have exactly what you need or better, you decide to walk away because the vendor doesn’t look welcoming at all.
You want to give a waiter a good tip when he serves you with a smile, even if the food turns out not that good; on the other hand, sometimes you’ll have some of the best food ever, but you won’t feel like giving the waiter a tip, even if you do, because he was grumpy.
More and more examples from our everyday life show how much a simple smile can change everything.
Forever engraved in my mind will be the smiling faces of the people of Thailand, the friendly pizza delivery boy, the welcoming supermarket vendor, the nice cashier at the bank, …etc.
It is these smiles that keep me wanting to go back, and that keep us all wanting to go back; looking at it from another view, if we break it down using business sense, a smile is one of the most effective means to generate sales and develop customer loyalty.
On top of all that, a smile is a very simple and easy thing to do, so it amazes why no one bothers to do it, it not only makes the person in front of you better, but it also makes you feel better as well, and I’m not making this up, it has been psychologically proven.
Personally, I’d like to see more smiling faces in this world; in the airports when I enter a new country, in companies, government agencies, restaurants, hotels, banks, everywhere; and I think it is up to governments to campaign about this, and even make it obligatory in certain important places like airports, hospitals, hotels…etc.
Let’s all simply smile.
关于微笑主题英语演讲稿4
Good afternoon, dear teachers and friends!
I' m happy to make a speech here. Thank you for your coming. Now, the topic for my speech today is “Western Festivals.” I would like to talk about Christmas.
Christmas is originally a Christian festival, as you can see from the formation of this word, “Christ-mas.” The first part of the word refers to Jesus Christ, and the second part “mas” comes from the word “mass,” referring to a main religious ceremony in some Christian churches. At first, it was celebrated for the birth of Jesus Christ. Nowadays, although some churches still observe this festival for its religious reason, for most people, including Chinese people, Christmas has already become a day of secular celebrations, when people exchange greetings and gifts. However, it is still a biggest festival in the West. It is as important to the Westerners as the Spring Festival is to the Chinese people.
Christmas day is on the 25th of December, and Christmas Eve is of course the evening of the previous day, the 24th December.
Christmas holiday usually lasts for two weeks, during which most schools have a Christmas break. Many families put the Christmas tree in their house, and hang many decorations on the tree. Under the tree, they usually place many Christmas presents. Giving out presents and receiving presents are what kids like best about this festival.
On Christmas Eve, kids would put stockings at the end of their bed, wishing the Santa Claus would come and give them presents.
As to the tradition of giving and receiving presents in Christmas, I think it has something to do with the nativity story. In the nativity story, on the birthday of baby Jesus, there was a bright star shining in the East. There were three kings in the East who saw the star, and they followed the star all the way to Bethlehem where the star stopped. They came to a manger where baby Jesus was lying. They worshiped the little baby and gave him presents. I think this is a beautiful story. It shows a spirit of sharing and love.
I like Christmas for the presents kids will receive and for its lovely story.
Thank you very much!
关于微笑主题英语演讲稿5
Life is not long, but many times choose, you have many choices come through today. Wait more than 60 days, you in turn to make a choice, but the choice is your life is very important, very crucial choice. The choice to a large extent directly related to your future direction in life, whether related to the future glory of life, and even the success of the big problems of life.
The last choice, because your young, largely by your parents or relatives to help you to make choices. Then the choice of their ability to help so you can create conditions to help you (for example, taking your difference, they can give you the money you read Choosing Health). Entrance options, but this largely depends on yourself decide the. Because: First, the difficulty of the selection bigger, some parents and relatives also lack guidance capability; second is the choice of policy, a more equitable, they may have money, but you also can not score enough money to help you. So many choices in this and future autonomy of the major is in your own hands.
Select certain subjective and objective conditions. The university entrance exam already created the objective conditions of choice. For example, the University has long been the face of the door here open for each student, you can enter with their conditions. Another example is that the state's admission policy is not directed against an individual, but against all the candidates this year, has been formed, you can only prepare the conditions required by policy to choose. Another example: you face the teachers and the teaching environment of objective factors in the last more than 60 days are basically constant. You can only adjust themselves to the further adaptation. Therefore, the objective conditions of your current studies, as if we can only face each generation has been formed as the productivity of conditions, can only be subjective on this basis up efforts to promote the development of the existing productive forces, not to complain about now have low productivity. This year's college entrance examination, you can only have been formed by the face of these subjective and objective conditions to efforts to improve their academic performance. Not to complain about the objective conditions than me.
In addition to other life choices, and many give up. But a lot of life to give up in order to better choices. You this time, the face of the university are beckoning to you, you can choose not to give up. Can also say: You give up a lot in the past, that is, to this choice. Example, Why did not you work outside the home? Why not stay at home farming? Why seeing your parents morning to evening, busy doing farming work, and even sick exertion in the field, and you share those concerns did not go home for their problem-solving, can you give up so they are not all for this time of choice?
Both gave up so much, they chose today, why not try to choose tomorrow? Beckon you do not choose to have this as another of the universities? There is the further purification of your soul, raise your quality, and increase your survivability, and improve your quality of life in the future to achieve greater value of life your furnace.
关于微笑主题英语演讲稿6
My Dream
Wide sea diving, the days of the birds to fly. Everyone carries a dream of their own.
However, what is the dream? What is dream? Dream is looking forward to, and the dream is strong - is fleeting dream you insist on the ideal as their courage and perseverance, are you responsible for their own highest level. But ask yourself, how many of us to accomplish his original dream in mind?
Our dream is a simple belief, is a future and life of their own responsibility. Perhaps, is the Youth
grand ambitions; perhaps, is the adolescent confusion and impulsive; maybe just a plain desire, desire applause, eager for success. Countless "may," innumerable "hope" because of our youthful full of miracles, large and small dreams in our hearts, in every corner of life filled with fragrance.
Only the ideal but no effort is useless. If you want to be a teacher, you should to study hard. If you want to be a player, you should do more exercises. If you want to become a businessman, he should learn to get along with people. For example, my wish is to be a famous writer grew up, because I really love writing, so from now on, I should read more, more accumulate knowledge, and strive to improve writing level. No pains, no gains, because my efforts, so my article was punished in many newspapers , and in many composition contest, I see the success I'm happy, so, struggle is the bridge to the ideal.
Yes, my dream. to give my famliy a warm, give my friend happy. Yes, my dream. The podium from the first station began his love this place, started from the first published an article looking forward to the world of words, decided to stay here from the beginning, stick to bottom of my heart desire.
Years in our faces no matter how many additional traces, no matter how much things to us across the chest wounds, as long as we have the right to breathe, to have a passion for remodeling dreams! Oxygen to survive as long as we have to have the courage to create a passion!
Choose to continue, select the value, select the achievements of the passion of life, the brave hearts of the initial dream of success!
关于微笑主题英语演讲稿7
Good evening ,Ladies and Gentlemen:
Thank you very much for choosing to come in such a cold night.Today my topic is about choice and process.A research shows that a man has to make 73 choices one day.With so many choices one day, people easily get so confused and afraid of making wrong choice that they hesitate and finally miss the true part of life. In my opinion, the following part is of much more importance than the choice. There is no absolute right or wrong choice but wonderful or boring life, which the process makes the difference.
Life is a box of chocolate,you never know what you will get. Forrest Gump made no decision by and for himself but he accomplished great success with his strong will in the process. The process is not the road itself but the attitudes and feelings ,the caution, courage and persistance we have as we encounter new experience and unexpected obstacles. Take myself as an example, I changed my major when I became a postgraduate. After the choice,days have been harsh for me.I cannot understand the new lessons at all. For they are closely related to mathmatics which I learned nothing about before. However wuth the belief that this is the great chance for me to experience new ideas and challenge myself,I persisted. I asked for help from every channel and reorgonized my life. Gradually I could understand some parts and even found maths interesting.Moreover, I learned to act instead of complaining. In retrospect,the choice left no trace in my mind but the happiness and bitterness of the past four months becomes an unforgetable experience in my life.
NO matter what the choice is, enjoy the process. In the process, your potential will be inspired and new discoveries,improvement and progress will come to you. These are the most beautiful sceneries and only on the way can you see it.These make your life colorful.
There is no need and I donnot want to judge whether it right or wrong for me to be here,but I congratulate to myself for I gain and enjoy this fantastic experience. So my dear friends,never worry about your choice and enjoy the process. I am sure you will get something new and intersting tonight after you chose to come here. Thank you!
关于微笑主题英语演讲稿8
In the picture we can see that a man is fishing attentively by the lake.Behind him there is a scholar who is stealing the fish in the man’s bucket.It is obvious that the drawer of the picture tries to reveal a serious problemin the academic circle of our country — plagiarism. In recent years academiccheats have become rampant. Quite a lot of graduate students and scholars“use” others’ ideas, articles and papers without acknowledging the sourceof information. They copy them without the fear that they might be caught.For a long time we paid less attention to the problem of plagiarism, butnow we are increasingly aware of its negative effects. Plagiarists’misconduct simply mean “stealing” others’ intellectual and academicaccomplishments, which not only depreciates their own humanity but contaminatesthe climate of the academic circle. Academic falsification is like an epidemicdisease that spreads fast and will destroy the healthy development of academicstudies. What’s worse, these plagiarists have set a very disreputable exampleto the younger generation.
So what attitude should we hold towards it? From my point of view, weshould resolutely battle against this ill phenomenon. Education of moralityshould be strengthened among the scholars and students. Those who steal others’academic achievements should be given severe punishment whenever they arespotted. If necessary, we can resort to the law to protect the interest of theoriginal writer and inventor. We must recognize that fighting againstplagiarism requires our persistent efforts.
关于微笑主题英语演讲稿9
Good afternoon, my dear friends.
I am very happy to meet you is my great honor to communicate with you at such a special t of all,please allow me to express my appreciation to you all to listion to me.
I am proud of being a college collegelife is fresh,new teachers, new classmates and new friends. I like the friendship, and their wide knowledge and opening mind. The grand library, school buildings and wide playground attrattde me very college life is better than I expected, I can do anything I like. In the college we can not only learn the professional knowledge,but also develop our comprehensive we can make full use of the period,we can learn many useful des,we should have the active attitude to our life,do a contributionto the egelife is the most precious time in our of us want to become an outstanding man. But there are some students still waste their time. They get together for eating, drinking or playing cards. They're busy in searching for a girlfriend or a boyfriend. They completely forget their task as college students.
Finally, I hope everybody can try their best to become a worthy person to our country, and make great contributions to the society!
关于微笑主题英语演讲稿10
GoodMorning / Afternoon, My dear teachers
My nameis Wu Yixuan. I am 11 years old, and I am a fifth grade student.
I have many hobbies. I like drawing and I can drawvery well, which get a lot of praise from my teachers and friends. I likesports, such as dancing, skating, biking and playing badminton. I often play badmintonwith my sisters and we have a great fun together. I love music, especially thepop music, which makes me feel relax. I love English, too. I hope I can travelall over the world one day.
I have manyfriends. I often study and play with Ke Jingqi and Zhu Si huai. Sometimes, wego to bookstore or supermarket together. We are so happy when we are together. Ilove my friends and they love me, too.
That'sall! Thank you for your attention.
译文:
老师上午好!(下午好)
我叫吴奕萱,我今年11岁,我是小学五年级学生。
我的爱好很多。我喜欢画画,我画的画可捧了,大家都夸我画得好。我喜欢体育运动,如跳舞、溜冰、骑自行车、打羽毛球。我经常和姐姐们一起打羽毛球,我们都非常开心。我喜欢音乐,尤其是流行音乐,它让我觉得很放松。我喜欢英语,我希望有一天我能到世界各地去旅游。
我有很多朋友。我经常和柯婧琪、祝思怀她们一起学习、玩耍。我们还一起逛书店、逛超市,我们在一起非常开心。我爱我的朋友们,她们也爱我!
我的演讲完毕,谢谢大家!
关于微笑主题英语演讲稿11
Hi, everyone! My name is . Today my topic is: “I Love English”.
English is now used everywhere in the world, It has become the most important language on internet. Learning English makse me confident and brings me great pleasure.
When I was eight , my father sent me to an English school. At there, I played games and sang English song with other children. Then I discovered the beauty of the language, and began my colorful dream in the English world.
Every day, I read English following the tapes. Sometimes, I like watching English movies for children, such as Finding Nemo, Harry Potter and so on. These movies not only improved my English, but also gave me a lot of fun. Outlook English also help me a lot in my English Studies, I have been watching this program for nearly two years.
I hope I can travel around the world someday. I want to go to America, because America is one of the most developed countries in the world. I also want to go to England, because English originated in England.
I love English, English has become part of my life. Do you like English, my friends? If you do, come with me. Let’s enjoy the fun of learning English built in a day.”
That’s all, thank you!
关于微笑主题英语演讲稿12
Dear teachers, dear students:
hello everyone!
The topic of my speech is "the hardness of life"
The vast desert, a tree stand, the show is a monument to the image.
Towering mountains, thousands of tree stand up, as is a magnificent the Great Wall.
The long river, all the trees stood up into a dragon of glory.
We are a symbol of too much, and too much. But I believe that my image is not "the gentlest hands, skin, such as Diorskin" Lin Daiyu, nor is the modern "unkempt and shabby", "Su Qier". We are a symbol of hope and vitality. So we show in front of others should be inserted without pleats, face without scale, modest and polite gestures exudes a stream of heroic spirit, the image of the vigor and vitality of the modern new youth, a into the embodiment of the spirit of nature.
Someone once said, life is a kind of hardness, integrity and dignity of life is propped up the hardness of bone. "Better life" and "the Kui back in the day, and not ashamed on the ground", which is always the traditional virtue of the China. Li Bai's "the eyebrow nengcui Zheyaoshan powerful thing, so that I may not be happy Yan" this awe inspiring atmosphere of the verse and whether it will make those no self-esteem people to shame? Loss of self-esteem is a worthless person, and we as the vanguard of the times, if drown in the darkness forever, or to do a dauntless hero, a flower in the wind and rain sonorous rose. The answer is self-evident. Desert desolate also has the monument stands, Castle Peak again proud, but also have the great wall around, the river again quiet, also there is a dragon in the recumbent. But the time can be changed, our image, our glory remains the same. Because we pride, because we are confident, because we have a fresh life. And because of this, it is a vast desert riparian long, Qingshan was evergreen, the hardness of life is forever.
关于微笑主题英语演讲稿13
a man who lived in a block of apartments thought it was raining and put hishead out the window to check. as he did so a glass eye fell into his hand.
he looked up to see where it came from in time to see a young woman lookingdown.
"is this yours?" he asked.
she said, "yes, could you bring it up?" and the man agreed.
on arrival she was profuse in her thanks and offered the man a drink. asshe was very attractive he agreed. shortly afterwards she said, "i'm about tohave dinner. there's plenty. would you like to join me?"
he readily accepted her offer and both enjoyed a lovely meal. as theevening was drawing to a close the lady said, "i've had a marvelous evening.would you like to stay the night?"
the man hesitated then said, "do you act like this with every man youmeet?"
"no," she replied, "only those who catch my eye."
关于微笑主题英语演讲稿14
Teachers, students, good morning!
I am a grade class (147) in . This is very honored to speak at the opening ceremony on behalf of the grade students.
Enter the grade, of course, our main task is to learn, learning, learning, hard, hard, and try again. Each course should be comprehensive development, improve efficiency. "Knowledge is power", let's do a meet the requirements of the new century outstanding young, to lay a solid foundation for the construction of the motherland future.
Of course, I feel that learning is mainly pay attention to methods, rather than the constrained square, play time, rote learning, should live learning.
We should listen attentively in class, more, ask more, and actively cooperate with the teacher, solve difficult problems in preview, comply with every lesson, to every minute of every class quality.
After class to review relative to prepare more critical, important is not the amount of knowledge, but the quality of knowledge. Continue to consolidate the learned knowledge, make them take root in the brain, and thrive. Repetition is the mother of learning, it can not only help us to consolidate knowledge, more important is can comb knowledge, spencer once said: "if a person's knowledge of and that his knowledge, the more the more he felt confused."
The classmates, as long as we can cherish the time, the opportunity will in our hands, I believe that the third this year will bring us more surprise.
Students, youth is the flower of life, the biggest sorrow of life is to live up to the youth, let us join hands to work together!
关于微笑主题英语演讲稿15
i come to this magnificent house of worship tonight because my conscience leaves me no other choice. i join you in this meeting because i am in deepest agreement with the aims and work of the organization which has brought us together: clergy and laymen concerned about vietnam. the recent statements of your executive committee are the sentiments of my own heart, and i found myself in full accord when i read its opening lines: "a time comes when silence is betrayal." and that time has come for us in relation to vietnam.
the truth of these words is beyond doubt, but the mission to which they call us is a most difficult one. even when pressed by the demands of inner truth, men do not easily assume the task of opposing their government's policy, especially in time of war. nor does the human spirit move without great difficulty against all the apathy of conformist thought within one's own bosom and in the surrounding world. moreover, when the issues at hand seem as perplexed as they often do in the case of this dreadful conflict, we are always on the verge of being mesmerized by uncertainty; but we must move on.
and some of us who have already begun to break the silence of the night have found that the calling to speak is often a vocation of agony, but we must speak. we must speak with all the humility that is appropriate to our limited vision, but we must speak. and we must rejoice as well, for surely this is the first time in our nation's history that a significant number of its religious leaders have chosen to move beyond the prophesying of smooth patriotism to the high grounds of a firm dissent based upon the mandates of conscience and the reading of history. perhaps a new spirit is rising among us. if it is, let us trace its movements and pray that our own inner being may be sensitive to its guidance, for we are deeply in need of a new way beyond the darkness that seems so close around us.
over the past two years, as i have moved to break the betrayal of my own silences and to speak from the burnings of my own heart, as i have called for radical departures from the destruction of vietnam, many persons have questioned me about the wisdom of my path. at the heart of their concerns this query has often loomed large and loud: "why are you speaking about the war, dr. king?" "why are you joining the voices of dissent?" "peace and civil rights don't mix," they say. "aren't you hurting the cause of your people," they ask? and when i hear them, though i often understand the source of their concern, i am nevertheless greatly saddened, for such questions mean that the inquirers have not really known me, my commitment or my calling. indeed, their questions suggest that they do not know the world in which they live.
in the light of such tragic misunderstanding, i deem it of signal importance to try to state clearly, and i trust concisely, why i believe that the path from dexter avenue baptist church -- the church in montgomery, alabama, where i began my pastorate -- leads clearly to this sanctuary tonight.
关于微笑主题英语演讲稿16
young!fortunately, i am young now. just due to it, i know that nothing is impossible.i firmly believe that nothing can stand in my way. if i can't realize my dream,it result from that i haven't work harder enough and i won't find other excuses. if no people believe you, you can make it to prove that you are right. if you think the god haven't blessed you and there is no truth here, you can become the god and create the truth.
"my breath swallows the sky and make the yellow river overflow, my sword is famous in kyushu and it can collapse the five sacred mountains." at some time in the past i also had am bitious words and i had some achievements. each achievement results from my hard work. i always believe that "if you want to have more achievements than others, you must work harder." in some extent, the dream is the hope. if you can insist on doing something, the victory will come.
hold fast to dreams, for if dreams die, life is a broken-winged bird that cannot fly. hold fast to dreams, for when dreams go, life is a barren field frozen with snow. so my dear friends, think of your old and maybe dead dreams. whatever it is, pick it up and make it alive from today. let's--- move ----out!
thank you for your listening!
关于微笑主题英语演讲稿17
autumn is lovely. it is the season of harvest. there are many oranges on the trees on tianping mountain. they were smiling at our arrival.
on the 12th november, , we came to the orange garden and saw many lovely oranges. some of them were not fully ripe, so their peels were green like small bells or lanterns. how beautiful! when i picked oranges, i needed to use force to pull them down. they seemed as if they were not willing to leave their mums—the orange trees. the oranges were big and round. their peels were very thin. we tasted a section of the orange. it was sweet and a slightly sour. i feel that suzhou has re
推荐阅读:
关于微笑主题英语演讲稿.docx
将本信息的Word文档下载到电脑
推荐度:
点击下载文档
文档为docx格式