关于介绍妈妈的英语作文简单【最新20篇】

Hello everyone！

Im a marketing professional from * * * University, and Id like to introduce myself. I like reading books and reading newspapers, because it can enrich my knowledge. I like running, because it can sharpen my will. What kind of person am I? I am a lively, cheerful, enthusiastic, persistent and strong willed person. Since today is the competition for the position of marketing manager, I want to talk about their understanding of marketing. Marketing is not the same as salesmanship, but salesmanship is an important part of marketing. If you want to do a good job in marketing, you must do your best to sell yourself. It is difficult for a stranger to trust himself, but only if the customer believes that he can, will he believe his product, and then he will better push his product into the market. I want “ be a man, do a job, do business, &rdquo. Thats what it means!

I think as a marketing manager, besides should have some marketing knowledge, but also should have good communication and coordination ability, can hard-working, good team spirit, pay attention to occupation moral. As a squad leader, I organized all kinds of activities in the class for three years. Through the organization of these activities, improve their ability to organize and coordinate, and strengthen the sense of teamwork. At the same time, I also fully realize that the individuals ability is limited after all, only through teamwork, brainstorming, and learn from each other, can we better complete the work. If this time I was fortunate to marketing manager, I want to build a platform for, yet the rigorous work in a relaxed atmosphere and their colleagues, we can cooperate with each other, with good team spirit.

At the same time, I think marketing is also a kind of service. Since it is a kind of service, we should make everyone satisfied and do it with enthusiasm and sincerity. Passion, the indispensable element in our work, is the motivation that pushes us to innovate and devote ourselves to work. With passion and a sense of self - challenge, I believe I can do the job. I hope that through my personal self introduction, I can give you an understanding of my efforts and sincerity. Thank you

When the summer comes, the weather is so hot, it is rarely to see the rain.

Today, when I wake up, I find the weather is chilly, it is going to rain. I am

so happy, I miss the rain so much. Suddenly, the rain drops from the sky, I ran

out of the house, looking at the sky, dancing with the rain. I feel so cool,

then all my weariness has gone.

每个家，妈妈是一个有多重身份的人：在孩子面前是母亲，在老人面前是儿媳妇……

一个晴朗的日子，全家人散完步回到家，本应高高兴兴的，却吵起了架。

起因是爷爷提起前几天的事，加上他脾气有点不好，于是数落了我一通。我自然不干：“您找我干啥？我又不是这事的主犯。”爷爷一看我不肯就范，忘记了煮饭是我爸爸而不是我。于是东拉西扯地找词儿批评我，那唾沫星子乱飞的景象，让人看了以为是我犯了什么“滔天大罪”，对我指指点点。

我一看周围的人都这样，于是跟爷爷理论起来。爷爷不提这事，就翻起陈年旧事来，对我说道：“你小子，我还教训不得你了？还顶嘴？上回……”我直接打断：“这都啥时候的陈年旧事了？”祖孙俩越吵越激烈。

关键时刻，妈妈站出来和稀泥：“都别吵了，两个都有错。超超，你给爷爷道个歉，这事就算结了。”

唉，幸亏有我妈来拆东墙补西墙，不然这场架不知要何时方休。

过完春节，刚开春。这天，我爸爸朝我吼了一声：“你小子昨天是不是偷拿了我的钱？”“哎哟喂，老爸，您看我这纯洁的小眼睛，我像是小偷吗？”可我爸不吃这一套，来了劲了，唾沫横飞，越说越来劲，劝不了。

关键时刻，稀泥有人来和：“昨夜不是你拿去买酒了吗？”和稀泥的顶尖高手用一句话就终结了老爸的唾沫，此人为我妈。

又是媳妇又是妈。生活中，她是终结唾沫的高手。

Henan has a humid warm-temperate climate. Dry and windy in winter and spring, the province is hot and rainy in summer and bakes in strong sunlight during the autumn months. Rainfall averages about 600-1000 millimeters increasing from north to south, as does the annual temperature which increases from about 12.8C in the north to 15.5C in the south.

Henan province is considered the cradle of Chinese civilization due to its location on the Yellow River. This rich historic heritage has endowed Henan with numerous historic treasures, from primitive dwellings to earliest wheel thrown pottery. The remains of some of the earliest human settlements have been unearthed here, including the over 7000-year-old Peiligang Culture Site, the 6000-year-old Yangshao Culture Remains and the 5000-year-old Dahe Culture Remains. All these cultural remains have profound significance in the history of Chinese civilization.

Luoyang City has been the capital of nine dynasties since the time of the Eastern Zhou Dynasty (770BC-221BC). There are many historical sites to be viewed in Luoyang as well as the opportunity to purchase replicas of the famed Tang three-glaze horses. Luoyangs Longmen Grottoes, famous for its grand treasure trove of Chinese Buddhist statues, are located 12km (7 miles) south of Luoyang. First sculpted and chiseled around 493 AD when the capital of the Northern Wei Dynasty (386-534) was moved from Datong City to Luoyang, the grottoes of Luoyang house an awe-inspiring collection of sculpted Buddha and other religious subjects.

Kaifeng, one of the ancient capitals, also boasts the following buildings worthy of a visit: Iron Pagoda (Tie Ta) of the Northern Song Dynasty (960-1127), Dragon Pavilion (Long Ting) - site of imperial palace of the Song and Jin dynasties - and the 1400-year-old Xiangguo Temple which is one of the most famous Buddhist temples in China. Also on view in Kaifeng are ruins of the Shang Dynasty, an important part of human cultural and historic heritage. The Shang Dynasty Ruins, also known as the Yin Ruins, are famous because of the unique style of the large palace and its grand mausoleums, in which emperors of the Shang Dynasty are buried. The bronze vessels of the Shang Dynasty, which were both finely decorated and popularly used by the citizens of the Shang Dynasty, are well-known at home and abroad.

The Yellow Mountain is one of the most famous mountains in China. It lies in the south of Anhui. Every year thousands of Chinese and foreigners pay a visit there. It s not far from here. It takes you about three hours to get there by bus. You can also go there by train or by plane. While you are climbing the mountain, you can enjoy the sea of clouds, wondrous pines and unique rocks around you. In the early morning when the sun rises, the sky looks very beautiful. It s really a nice place to visit.

黄山是中国最著名的山脉之一。它位于安徽的南部。每年都有成千上万的中国人和外国人去那里参观。离这儿不远。乘公共汽车到那儿大约需要三个小时的时间。你也可以乘火车或乘飞机去那里。当你在爬山的时候，你可以欣赏到你周围的云朵，奇异的松树和独特的岩石。清晨，太阳升起时，天空看起来很漂亮。这真是一个很好的地方。

[介绍黄山的英语作文带翻译

I am from XXX a communist party official community members, I call XXXX. On December 12th XXXX to join the Chinese communist party, and in XXXX on dec. 15 in July, xxxxwill achievebecomes smooth finish school joins XXXX district branch organization of this glorious.

During the period of school I studied the financial accounting major, and the students management organization, in their constant efforts become an excellent student body President. In his work, the first learned to work, a good leader should have excellent work unceasingly, will have good interpersonal relationship.

Learn financial, enlightened life. XXX, let me understand the professional study, to be one step a footprint, the collapse of tashi. Now that Im graduating from college, but walked into the classroom society, I knew I have many insufficient place, so after learning, I will like to sit in the senior leaders, learn a lot.

In order to progress to the community, in order to reflect the progress, the streets of advanced nature of the communist party of China, let us work together!

My favourite animal is the giant panda. The giant panda or panda is a bear living in central western and south western China. Most pandas live in Sichuan province. Pandas are adorable because of their distinctive black patches around eyes, ears and across its round body. Pandas are China’s national treasures. They’re among the world’s most adored and protected animals. Pandas are the star attractions in the Beijing Zoo. Experts say that despite their sweet public image, pandas are capable of attacking humans, especially if they feel threatened.

Hello, my professors.it’s a fine day today,and i’m very pleased to meet you here.first of all,i’d like to introduce myself to you.my name is ***,my hometown is ***,which is a really beautiful city.even when i was a young boy,i was very interested in accounting .every one may have a dream,and i still remember that my dream is to be a accountant .still today i think that interest is the best teacher in one’s whole life (and knowledge comes from practice).

Second, i will introduce my major .my major is accounting in *** university.and my major,which lays more stress on practical use, seems to be at the end of it.when both of them interact well enough,the discovries and theories in biology science can be soon turned into products in all of the modern industry.

Four years’ university education gives me a lot of things to learn,a lot of chances to try,and a lot of practices to improve myself.it teaches me not only what to study and how to think,but also to see the importance of

Practical ability (such as doing expriment as much as possible). in the university life,i have made many good friends.they help me improve my study and research ability, do ererything just like a man,and often give me good example to follow.

Besides what i have introduced myself above,i also have many interests in my spare time.i like playing football,which is an effective way i think to improve my body health,and it can teach me how to join in a group and deal with other people.drawing and writing is another favor to me.above all,i choose the major in order to broad my view in accounting ,and enhance my research ability.i will do my best to join the new group and be good at postgraduate study.

Good morning !

It is really my honor to have this opportunity for an interview， I hope I can make a good performance today. Im confident that I can succeed.Now I will introduce myself briefly.I am 26 years old，born in shandong province .(General Introduction)

I was graduated from Qingdao university. my major is electronic.and I got my bachelor degree after my graduation in the year of 2015. During university， I spent most of my time on study so that I have passed CET4/6 .and acquired basic knowledge of my major.(Education background) I think Im a good team player and Im a person of great honesty to others. Also I am able to work under great pressure.

Thats all. Thank you for giving me the chance.

Short-story writer, essayist, critic, and literary theorist who is considered to be one of the greatest figures in 20th-century Chinese literature. Lu Xun, hailed as "commander of Chinas cultural revolution" by Mao Zedong, is typically regarded as the most influential Chinese writer who was associated with the May Fourth Movement. Lu Xuns acclaimed short stories appeared in three collections between the years 1923 and 1935. He also produced sixteen volumes of essays, reminiscences, prose poetry, historical tales, some sixty classical-style poems, and a dozen volumes of scholarly research, and numerous translations. His main works are:Call to Arms (1922) "A Madmans Diary" (1918) "Kong Yiji" (1919) "Medicine" (1919) "Tomorrow" (1920) "A Small Incident" (1920) "The Story of Hair" (1920) " Storm in a Teacup" (1920) "My Old Home" (1921) "The True Story of Ah Q" (1921) "The Double Fifth Festival" (1922) "The White Light" (1922) "The Rabbits and the Cat" (1922) "The Comedy of the Ducks" (1922) "Village Opera" (1922) from Old Tales Retold (1935) Mending Heaven (1935) The Flight to the Moon (1926) Curbing the Flood (1935) Gathering Vetch (1935) Forging the Swords (1926) Leaving the Pass (1935) Opposing Aggression (1934) Resurrecting the Dead (1935)

[介绍作家鲁迅的英语作文

Good morning. I am glad to be here for this interview. First let me introduce myself. My name is l, 24. I come from Nanchang,the capital of Jiangxi Province. I graduated from the ****** department of *****University in July ,2001.In the past two years I have been prepareing for the postgraduate examination while I have been teaching *****in NO.****middle School and I was a head-teacher of a class in junior grade two.Now all my hard work has got a result since I have a chance to be interview by you.

I am open-minded ,quick in thought and very fond of history.In my spare time,I have broad interests like many other youngers.I like reading books, especially those about ****.Frequently I exchange with other people by making comments in the forum on line.In addition ,during my college years,I was once a Net-bar technician.So, I have a comparative good command of network application.I am able to operate the computer well.I am skillful in searching for information in Internet.I am a football fan for years.Italian team is my favorite.Anyway,I feel great pity for our countrys team.

I always believe that one will easily lag behind unless he keeps on learning .Of course, if I am given a chance to study ****** in this famous University,I will spare no effort to master a good command of advance ******.

Hello,everyone here.Now,please let me introduce myself to you.I am the only girl in my family. For my own hobbies, I love traveling，listening to music and reading.From these hobbis, you can see,I would like to live a free life.Of course, everyone has some strong points.without myself exception,for instance,both of playing the piano and drawing are my strong points.At present,I am satified with my life. The activities in school are great.My teachers and classmates are friendly to me.For my parents,both of them are managers.They are always busy working.As for my ideas of going abroad to study, I think it is useful and wonderful if we have the chance to do so.I also would like to go abroad to study to improve myself.Thats all.Thank you.

Good morning ladies and gentlemen!I am of great hornor to stand here and introduce myself to you .First of all , my chinese name is XX and my english name is XX .I am XX years old. I am open-minded ,quick in thought and very fond of English.In my spare time,I have broad interests like many other youngsters.I like reading books, especially those about XX . Frequently I exchange with other people by making comments in the forum on line.It is my long cherished dream to be a member of English . I think Im a good team player and Im a person of great honesty to others. Also I am able to work under great pressure.

That’s all. Thank you for giving me this chance.

导语：英国是欧洲西北部的一个国家，也是大不列颠及北爱尔兰联合王国最大和人口最多的组成国。下面是yuwenmi小编为大家整理的优秀英语作文，欢迎阅读与借鉴，谢谢!

England is a nation in northwest Europe and the largest and most populous constituent country of the United Kingdom of Great Britain and Northern Ireland. Its inhabitants account for more than 83% of the total population of the United Kingdom, whilst the mainland territory of England occupies most of the southern two-thirds of the island of Great Britain and shares land borders with Scotland to the north and Wales to the west. Elsewhere, it is bordered by the North Sea, Irish Sea, Atlantic Ocean, and English Channel.

England was formed as a country during the 10th century and takes its name from the Angles — one of a number of Germanic tribes who settled in the territory during the 5th and 6th centuries. The capital city of England is London, which is the largest city in the British Isles, capital of the United Kingdom and one of the worlds Global Cities.

England ranks as one of the most influential and far-reaching centres of cultural development in the world;it is the place of origin of both the English language and the Church of England, was the historic centre of the British Empire, and the birthplace of the Industrial Revolution.

The Kingdom of England was an independent state until 1 May 1707, when the Acts of Union resulted in a political union with the Kingdom of Scotland to create the Kingdom of Great Britain.

Englands National Day is St Georges Day (Saint George being the patron saint), and it is celebrated annually on 23 April.

【参考译文】

英国是欧洲西北部的一个国家，也是大不列颠及北爱尔兰联合王国最大和人口最多的组成国。它的居民占英国总人口的83%以上，而英国大陆的领土则占大不列颠岛南部的三分之二，与苏格兰接壤，北面与威尔士接壤。在其他地方，它与北海、爱尔兰海、大西洋和英吉利海峡接壤。

十世纪，英国形成了一个国家，并以盎格鲁人的名字命名，这是一个日耳曼部落中的一个，他们在第五和第六世纪定居于该领土。英国的首都是伦敦，它是不列颠群岛中最大的城市，是英国的首都，也是世界城市之一。

英国是世界上最具影响力和影响深远的文化发展中心之一，是英国语言和英国教会的发源地，是大英帝国的历史中心，也是工业革命的发祥地。

英国王国是一个独立的国家，直到1707年5月1日，当时的联邦行动导致了与苏格兰王国的政治联盟，建立了大不列颠王国。

英国的国庆节是圣乔治纪念日(圣·乔治是守护神)，每年4月23日庆祝。

Good morning. It is my honour to come here for this interview.

First let me introduce myself to you. My name is Wendy. I am 17 years old, and was born in Jinan, Shandong Province. I was graduated from ** Middle School.

I am always studying hard, and I have achieved lots of fruitful results, including many certifications.

I am optimistic and open-minded. I have made a lots of good friends in my school.

In my spare time, I like reading and listening to the music. Sometimes, I also like to play basketball.

I hope I have the chance to enter the school. And I also believe that where there is a will, there is a way.

That is all. Thanks for your attention.

As the new bell tolled, the Chinese people exclaimed with excitement, "the New Year is here! New Year! Ah! What a wonderful New Year! I am excited to run back and forth in my home, unable to restrain my joyful mood, the Spring Festival composition 600 words. When I ran to the balcony, all of a sudden, the fireworks fly on the sky, in a flash, Fried opened, and some like countless meteor, some like colorful flowers, some like golden coat, and like the golden sun, the earth was like the day. How beautiful!

I come from Enshi, Hubei Province, a small developing town. I like to watch

the scenery, walk, chat on the Internet and play games.

In sports, I occasionally play basketball, football, soldier ball and

badminton.

For the coming college life, my expectation is to learn English well, adapt

to college life as soon as possible,

and also hope to know more friends. Wonderful four years of University.

In addition, I am professional and solid, reading is my greatest enjoyment,

and studying computer makes me feel happy.

Im practical in my work, and Ill finish no matter how small I am.

I can repair the computer, manage the network, network operation and online

sales.

Whats important is that I have a kind of spirit of persevering in

research, a kind of neck that will never stop until I understand.

"Only my mother is good, mothers like a treasure ... ..." hear this familiar melody, a picture of my moving picture and surfaced in my eyes.

That day, under heavy rain, blowing winds, even the trees outside the window is also staggering. Day crying, I am crying, because I have a fever of 39 degrees. My mother regardless of thirty-seven twenty-one, holding me to the hospital to run, her face wet, can not tell is the rain, sweat, or tears ... ...

Mom finally took me to the hospital, then it is already morning, the doctors are asleep. Mom kept knocking on the door, after a long time the doctor was blind to appear in front of us, his attitude is very bad. Mom busy said: "I am sorry, my son made a high fever, please help him look at it!" Doctor see my mother so polite, attitude also improved. Help me read the disease, the doctor called my nurse sister to help me injections, take medicine ... ...

Home is already 4 oclock in the morning, I lay in bed, see my mother was busy helping me get medicine, when she handed me the drug, I clearly see her hands covered with cocoon, and my heart said no Out of the taste, this pair of hard work is hard-working performance, is the performance of love ah!

Mom, you are my favorite person, I will keep your love in mind, learn, become a knowledgeable person, never live up to your love for me. Mom, here, I want to say thank you, but also say "I love you!"

Hello，everyone！

My name is Winnie.Im a 15 years old girl. I live in the beautiful city of Rizhao.

Im an active，lovely and clever girl.In the school，my favourite subject is maths.Perhaps someone thinks its difficult to study well.But I like it.I belive that if you try your best，everything can be done well.

I also like sports very much.Such as，running，volleyball and so on.

Im kind-hearted. If you need help，please come to me .

I hope we can be good friends！

OK.This is me .A sunny girl.

[自我介绍英语作文精选

My mother is a very simple mother, her thrift, bear hardship without complaint to give up everything for us, I love her very much..

I remember one time I went to my grandmothers house, playing all day, tired to sleep, but in the evening, I had a fever, my grandma this is panic, and give me water, while saying, how can this do? In desperation, grandma called mother. Father and mother rushed, my mother gave me to feed water, take medicine, and then stroked my head, sleep! A fever is. In the mothers comfort, I soon fell asleep, mother? Did not sleep a wink all night. When I called to see mother woke up, the haggard face, could not help but shed tears, I ran into her mothers arms and said "Mom, I love you."

I love my mother. Happy mothers day to all mothers in the whole world.

我的妈妈是一位很朴素的妈妈，她勤俭节约，任劳任怨地为我们付出一切，我非常爱她。

记得有一次我去奶奶家，玩了一整天，累了就睡了，可是到了晚上，我却发起高烧来，奶奶这下可慌了手脚，一边喂我水，一边叨叨，这可怎么办?情急之下，奶奶拨通了妈妈的电话。爸爸和妈妈急匆匆地赶来，妈妈给我喂水，吃了药，然后抚摸着我的头，睡吧!一会就退烧了。在妈妈的安抚下，我很快就睡着了，可妈妈呢?整晚没有合眼。当我一叫醒来时，看到妈妈那憔悴的脸庞，禁不住地流下了眼泪，我扑进妈妈的怀里说;“妈妈，我爱你。”

我特别爱我的妈妈。祝天下所有的妈妈母亲节快乐。

[2017年写我的妈妈英语作文带翻译

Hi, everybody! My name is XXX, this year 19 years old, is a Gemini girls. X class from electronic engineering department of automation.

By face to face with self adjusting post match, let me know more about myself. About my character: I am friendly, serious, responsible, loyal to their duties, have the sense of responsibility. Principle of life is to be honest, other people can be honest with you. So the heavy friendship, attaches great importance to the relationship with friends. I ready to help others. Easy-going personality, willing to get along with people. Want to be a popular person. Social adaptation ability. Sensitive to interpersonal relationship, the people, to the thing, and better insight on the surrounding environment. I like to like to listen to, also like the pragmatic. With the spirit of perseverance, as long as I think I should do, no matter how difficult it will be to do. I do have very strong principle and flexible, respect the agreement. Is a standard Gemini girl like to stay in a quiet place to study work and life. Although I sometimes have a strong emotional reaction, but usually reluctant to personal feelings. My interests: my hobby is reading literature books, like the fable story, like detective fiction, but sometimes obsession and harm the eyes. The pursuit of nature, like to study in play in the way of life. Love ancient buildings, like that has a sense of place. I have very strong curiosity to new things, and study on things you dont understand, have stronger ability to learn. I like the pragmatic, the pursuit of specific and clear. Rational thinking like according to actual situation. Pay attention to the details of things, like judging from the details. Skills: I have the ability to learn, because I am from vocational schools on me than my classmates many mastered the basic mechanical principle, mechanical manufacturing technology, mechanical manufacturing base,

Mechanical drawing (including the basis of CAD application), literature common sense, and so on. Motor coordination ability strong, the incident response his swift, have very strong right control. Can move hand is strong, for small things quickly and have the right. In other ways, language expression ability is stronger, good at communication with people.

I think the primary task of college students is to learn cultural knowledge, therefore I steadfastly, in the study did not relax. I think a good method of study is very helpful to learn knowledge, so after each test, I will summarize the learning experience. No pains no pains, no gains, nothing is impossible. Good optical knowledge on book is not enough. I think learning is the students profession, the profession also needs to have the wisdom, perseverance and perseverance. In todays rapid development of information age, we only by constantly learning new knowledge, dont fall behind. College, rich and colorful social life and sleek and nervous learning atmosphere, I got many different levels of exercise and test; The attitude of calm and calm is my respond. The hobby is widespread makes me very enrichment; So many friends that I feel rich! I very strong dedication and sense of responsibility that I can face any difficulties and challenges.

Thank you for your attention

嗨，大家好!我的名字叫做xxx，今年十九周岁了，是一名双子座女生。来自电子工程系自动化x班。

通过直面自我认知调整人职匹配，让我更了解自己。我的性格：我待人友善，待事认真、负责、忠于职守，具有责任感。做人原则是要真诚待人，别人才能真诚待你。所以重友谊，重视与朋友之间的感情。为人热情乐于助人。性格随和，乐于与人相处。希望做一个受大家喜爱的人。社会适应能力强。对人际关系敏感，对人、对事、对周围环境的洞察能力强。我喜欢喜欢聆听，也喜欢务实。具有坚定不移的精神，只要我认为应该做的事情，不管有多困难都会去做。我做事具有很强的原则性，也善于变通，尊重约定。是一个标准的双子座女生喜欢呆在安静的地方学习工作和生活。我虽然有时候有很强的情绪反应，但通常不愿将个人情绪表现出来。我的兴趣：我爱好阅读文学书籍，喜欢寓言故事，喜欢侦探类的小说，但是有时会痴迷而伤害眼睛。追求自然，喜欢在游玩中学习生活方式。喜爱古建筑，喜欢那有着历史感的地方。我对新事物具有很强的好奇心，也钻研于自己不明白的事物，具有较强的学习能力。我喜欢务实，追求具体和明确的事情。喜欢依据实际情况理性考虑问题。关注事物的细节，喜欢从细节来判断事物。我所拥有的技能：在学习能力上，因为我是从职校上了我比同班的同学多掌握机械原理、机械制造工艺基础、机械制造基础、

机械制图(包括CAD的基础应用)、文学常识等等。运动协调能力强，对事件反应敏捷迅速，具有很强的正确控制力。能动手力强，对于细小事物能快速而有正确的操作性。在其他方面，语言表达能力较强，善于与人沟通。

我觉得大学生的首要任务还是学好文化知识，所以在学习上我踏踏实实，一点也不放松。我认为好的学习方法对学好知识很有帮助，所以在每次考试后，我都会总结一下学习经验。一份耕耘一分收获，没有什么事是不可能的。光学好书本上的知识是远远不够的。我认为学习是学生的职业，这份职业同样需要有智慧、毅力和恒心。在当今这个快速发展的信息时代，我们只有不断汲取新知识，才不会落伍。 大学里，丰富多彩的社会生活和井然有序而又紧张的学习气氛，使我得到多方面不同程度的锻炼和考验;沉着和冷静是我遇事的态度;爱好广泛使我非常充实;众多的朋友使我倍感富有!我很强的事业心和责任感使我能够面对任何困难和挑战。

谢谢大家

[英语作文大学自我介绍