介绍美国的英语作文50个单词（合集20篇）

Hello everyone.

Now let me talk about myself.

My name is _____.I was born in _____.There are _____people in my family, my father is a _____, my mother is a _______.And as everyone know,Im a student.Everyone has his own interests.As for me,I like reading books,playing basketball,listening to the music and so on.Now today we are in the same class,I hope we will get on well with each other.Thanks.

大家好。

现在让我来介绍一下我自己

我的名字叫______。我出生在_______。我家有_______口人，我的爸爸是一个________,我的妈妈是_______。那么就如大家所知，我当然就是一个学生了。每一个人都有他自己的兴趣。至于我，我喜欢看书，打篮球，听音乐等等。今天我们相聚在同一个教室，我希望我们将会相处愉悦。谢谢大家。

I went to my cousins house on the first day of the holidays and got a piece of good news that his wife was pregnant;She said shes worrying about getting fat，but on her face there was a unconcealable pleasure of conceiving a baby.My cousin told me that hell educate his child in a severe way，with a future fathers matureness.Im happy for them.：)

Yesterday，our research schools soccer team had a match with the graduate students from the department of international business.It was almost a close game in the first half，but we seemed lacking of vigor in the second half，so，we lost the game.

Half of the National Day holidays have passed by...life still goes with good and bad times.

My name is "Zhou Kunren". It is called Kun Ren because my parents want me to become a strong, brave and helpful man through my efforts.

I study in grade four of XX primary school. I am lively and cheerful, and I like making friends. I have many hobbies. Swimming, playing basketball and playing football are all my favorites.

My academic record is very good, and I get more than 90 points in every subject, and I speak actively in class. After class, I am still a teachers assistant, helping teachers distribute their homework and organize activities.

The reason why I came to the eloquence class of young leaders is to improve their eloquence and make more friends. My ambition is to be a brave SWAT to protect our country and people. Lets make friends together. My name is Zhou Kunren.

I have two puppies in my house. One is white, one is gray. White called Pippi, it is very naughty so called Pippi. Gray called obediently, it is well behaved so it is called obediently. But I liked Pippi.

Pippi it loves to sleep and eat asleep. But it heard someones footsteps, but also how diligent, it will be barking, tell us that someone came. But when I came, it not only shouted, but also came out to meet me. It is very obedient, we call it out to play, it goes out to play, as long as we called Pippi at the door, it will soon run back.

Pippi its appetite ok, give it anything to eat, as long as not bad things can be. Pippi it is a big variety, and our geese like.

Whenever I am very sad when it will run over to coax me, accompany me to play. Every time I am happy when it will be happy. Its unhappy when ill take it out to play. It was happy when I was happy.

This is my dog my favorite puppy skin. Okay, yes, forget what Phi Phi sleeps like. It sleeps like people, most of them are legs straight to the right lying, it is like a sleep will be snoring.

To solve the problems concerning making friends on line, I think, the government should take strong measures to punish those who cheat people on line.

As for those Internet users, they should be cautious when making friends on line.

The Double Seventh Festival on the 7th day of the 7th lunarmonth is a traditional festival full of romance. It often goes into August in the Gregorian calendar.

This festival is in mid-summer when the weather is warm and the grass and trees reveal their luxuriousgreens. At night when the sky is dotted with stars and people can see the Milky Way spanning from the north to the south. On each bank of it is a bright star which see each other from afar. They are the Cowherd and Weaver Maid and about them there is a beautiful love story passed down from generation to generation.

Long long ago there was an honest and kind-hearted fellow named Niu Lang (Cowhand). His parents died when he was a child. Later he was driven out of his home by his sister-in-law. So he lived by himself herding cattle and farming. One day a fairy from heaven Zhi Nu (Weaver Maid) fell in love with him and came down secretly to earth and married him. The cowhandfarmed in the field and the Weaver Maid wove at home. They lived a happy life and gave birth to a boy and a girl. Unfortunately the God of Heaven soon found out the fact and ordered the Queen Mother of the Western Heavens to bring the Weaver Maid back.

With the help of celestial cattle the Cowhand flew to heaven with his son and daughter. At the time when he was about to catch up with his wife the Queen Mother took off one of her gold hairpins and made a stroke. One billowyriver appeared in front of the Cowhand. The Cowhand and Weaver Maid were separated on the two banks forever and could only feel their tears. Their loyaltyto love touched magpies so tens of thousands of magpies came to build a bridge for the Cowhand and Weaver Maid to meet each other. The Queen Mother was eventually moved and allowed them to meet each year on the 7th of the 7th lunar month. Hence their meeting date has been called "Qi Xi" (Double Seventh).

Scholars have shown the Double Seventh Festival originated from the Han Dynasty (206 BC-AD220). Historical documents from the Eastern Jin Dynasty (AD371-420) mention the festival while records from the Tang Dynasty (618-907) depict the grand evening banquetof Emperor Taizong and his concubines. By the Song (960-1279) and Yuan (1279-1368) dynasties special articles for the "Qi Xi" were seen being sold on markets in the capital. The bustling markets demonstrated the significance of the festival.

Today some traditional customs are still observed in ruralareas of China but have been weakened or diluted in urban cities. However the legend of the Cowhand and Weaver Maidhas taken root in the hearts of the people. In recent years in particular urban youths have celebrated it as Valentines Day in China. As a result owners of flower shops bars and stores are full of joy as they sell more commodities for love.

Today early in the morning, li hong would visit to San Francisco. Among them, li hong is the most impressive is the Intel museum.

Just a arrived in a blizzard wafts of the science museum, threshold before those incredible illusion, now all become a reality in my eyes, most especially, I saw "anatomy" internal computer, reminds people of multifarious, the winding river maze.

Li hong to see at ordinary times the computer always is so convenient, give people many benefits, but who thought about it how complicated the internal? Today I finally saw computer has not come easily. Computer, is the main chip, chip it, far look like a endless endless maze, the chip is small, can want to make a really difficult!

First, cut the chip plate at the bottom of the well, but at the bottom of the plate but with hard gold wire to build by laying bricks or stones becomes, in the process of making chips, making people have to keep the body clean, because in the process of production, chip internal cannot be stained with a trace of dust. Otherwise, the previously kung fu can be disqualified! The whole production process must. Be careful, and every parts need to be selective, meticulously, it is conceivable that a computer is made up of many "meticulously" ah

Good afternoon, professors !I am great honored to meet you here.Now allow me to give a brief self-introduction.

My name is xx, xx years old, born in xx city, xx province. I have been working for nearly xx years. I am open-minded, quick in thought and very fond of history. In my spare time, I have broad interest like many other youngers.

In year xx, I entered xx, major in xx. After my graduation, I entered xx University to study my postgraduate course, major in xx. In those 7 years study, I worked hard, and I gained scholarship for many times.

During 3 years study in xx University, under the strict guidance of my tutor, I have learned systematically the theory of xx. I benefit from working together with excellent colleague. xx University shares many same characteristics with xxx University. Both of them have a refreshing, scholarly atmosphere.

After my graduation in xx, I worked in xx. I got a position in xx. However, with time going on, the more I experienced, the clearer I realized that I am really interested in xx. I am eager to learn more about xx and I hope I can study further. I wish to find a way to solve the complicated problem in my daily work.

So I started the way to pursuing my studies in xx, and work hard for about half year. Now all my hard word has got a result since I have a chance to be interview by you. If luckily I got the chance to learn xx, I will work harder than before. Thank you!

美国是世界上最发达的国家，对于美国，你的了解有多少?下面，是小编为你整理的有关介绍美国的英语作文，希望对你有帮助! 有关介绍美国的英语作文篇1

Based on historical documents, modern survey and statistics, as well as the result of predecessor studies, the trend and main process of forest dynamics are recognized. The forest area and forest coverage rates for each province of China from 1700 to 1949 are es- timated backward by every 50 years. Linking the result with modern National Forest Inventory data, the spatial-temporal dynamics of Chinese forest in recent 300 years (AD 1700–1998) is quantitatively analyzed. The study shows that in recent 300 years, the forest area in current territory of China has declined by 0.95×108 hm2 (or 9.2% of the coverage rate) in total, with a trend of decrease and recovery. Before the 1960s, there was a trend of accelerated de- scending. The forest area was reduced by 1.66×108 hm2 (or 17% of the coverage rate) in 260 years. While after the 1960s, there has been a rapid increase. The forest area increased by 0.7×108 hm2 (or 8% of the coverage rate) in 40 years. The study also shows that there is a significant spatial difference in the dynamics of forest. The amplitudes of increasing and de- creasing in western China are both smaller than the ones in eastern China. During the rapid declining period from 1700 to 1949, the most serious decrease appeared in the Northeast, the Southwest and the Southeast, where the coverage rate in most provinces dropped over 20%. In Heilongjiang Province, the coverage rate dropped by 50%. In Jilin Province, it dropped by 36%. In Sichuan Province and Chongqing Municipality, it dropped by 42%. In Yunnan Prov- ince, it dropped by 35%. During the recovery period 1949–1998, the western provinces, mu- nicipality and autonomous regions, including Ningxia, Gansu, Inner Mongolia, Si- chuan–Chongqing, Yunnan, Tibet, Xinjiang and Qinghai, etc, the increase rates are all below 5%, while the eastern provinces, municipality and autonomous regions (except Heilongjiang, Hubei, Jiangsu–Shanghai) have achieved an increase over 5%, among which the Guang- dong–Hainan, Guangxi, Anhui, Beijing–Tianjin–Hebei, Shandong, Henan, Zhejiang, and Fu- jian have an increase over 10%. 有关介绍美国的英语作文篇2

A history of long and effortless success can be a dreadful handicap,but,if properly handled,it may become a driving force.When the United States entered just such a glowing period after the end of the Second World War,it had a market eight times larger than any competitor ,giving its industries unparalleled economies of scale.Its scientists were the worlds best,its workers the most skilled.American and Americans were prosperous beyongd the dreams of the Europeans and Asians whose economeics the war had destroyed.

It was inevitable that this primacy should have narrowed as other countries grew richer.Just as inevitably,the retreat from predominace proved painful.By the mid 1980s Americans had found themselves at a losss over their fading industrial competitiveness.Some huge American industries,such as consumer electronics,hand shrunk or vanished in the face of foreign competitiong.By 1987 there was only one American television maker left,Zenith.(Now there is none :Zenith was bought by SouthKoreasLGElectronics in July.)Foreign made cars and textiles were sweeeping into the domestic market.Americas machine-tool industry was on the ropes.For a while it looked as though the makeing of semiconductors,whidh America had invented and which sat at the heart of the new computer age,was going to be the next caualty.

All of this caused a crisis of confidenc.Americans stopped taking prosperity ofr granted .They began to believe that their way of doing business was failing,and that their incomes would therefore shourtly begin to fall as well .The mind -1980s brought one inquiry after another into the causes ofAmericas in dustrial decline.Thir sometimes sensational findings were filled with warnings about the growing competitiong from overseas.

How things have changed!I1995 the United States can look back on five years of solid growth while Japan has been struggling.Few Americans attribute this Self doubt has yielded to blind pride.American industry has changed its structure ,has gone on a diet ,has learnt to be more quik witted,according to Richard Cavanagh,executive dean of Harvards Kennedy School of Government.It makes me proud to be an American just to see how our businesses are improving theirproductivity,says Stephen Moore of the Cato Institute ,a think tank in Washington,DC,And William Sahlman of the Harvard Business School believes that people will look back on this perido as a golden age of business management in the United States.

[2017年有关介绍美国的英语作文

Halloween is for the "All Hallows Evening"。 However， due to various reasons， Halloween has become the years most popular and one of the most popular festivals， and many players with great enthusiasm to celebrate this holiday。

Halloween in the October 31， in fact， praise and autumn festivals like Beltane is the festival of spring like the praise。 Of ancient Gaul， Britain and Ireland priest - druid to have a grand festival praise of autumn， from October 31 beginning at midnight the following day， November 1 continued all day。 In their view， that night they are a great Death - Salman to that year were all summoned the ghost of dead people， these evil spirits are subject to care for the Livestock Health and punishment。 Of course， as long as the thought of such a gathering of ghosts， it was enough to make fools of those simple-minded understanding of the heart bile war。 So they lit the sky of the bonfire， and close surveillance of these evil spirits。

Halloween witches and ghosts everywhere to say is just the beginning。 So far in Europe， there are some isolated areas where people believe it is true。 Ancient Rome in November 1 there is also a holiday， which is used to pay tribute to their goddess of Bo Mona。 They bear ribs roasted nuts and apples before the bonfire。 Our own Halloween seems to be a holiday by the Romans and the druids holiday blend made of。 Halloween activities in the original is very simple， and mostly in the church carried out。 However， in the whole of Europe， it is regarded as a Halloween enjoy slapstick， Jiangguigushi and a good opportunity to scare each other。 So people will no longer be used to praise this Autumn Festival， but it becomes supernatural， witches and ghosts festival。

This is a good news for Chinese singers, it is said that there will be a Chinese music group and a man invited to performance in the American famous music show. It sounds so inspiring, it seems that Chinese music has been introduced into American market. While the fact is not, the invited Chinese singers only get their performance when the advertisement time comes, it is so awkward, they are given the unimportant time. Chinese music still not get into the American musical market, American people just want to catch Chinese people’s attention and go into Chinese market, so they invited the Chinese singers. I believe that our Chinese music will get be popular around the world some day.

这对于中国歌手来说是个好消息，据说中国的一个乐团和一个男歌手受到邀请去美国著名的音乐节目表演。这听起来很励志，似乎中国的音乐已经打进了美国的市场然而事实并非如此，受到邀请的歌手仅仅只在广告的时间来进行他们的表演，这是多么尴尬啊，给予他们的时间是如此的不受重视。中国的音乐仍然没有打进美国英语市场，美国人民只是想要吸引中国人的注意，打进中国的市场，因此他们邀请了中国的歌手。我相信中国的音乐总有一天会在全世界变得流行。

I was a shy girl and I never dared to make performance in the public, but

everything will have the exception. Last week, our English teacher gave us a

job. All students needed to make performance in group. I was chosen to be the

protagonist in my team. At first, I told them that I couldn’t make it, but they

believed that I was the suitable person. So I practised hard and tried to get

over my fear. It was my stage. I stood in front of my classmates. With my

teammates, I finished my job. I felt so cool and dared to face so many

people.

Im Hua Zhengxian. Im ten years old. Im in Class 5,Grade 4. My hair is short. My eyes are small. I get up at six oclock. I have breakfast at six fifteen. I go to school at seven oclock. I have lunch at twelve oclock. I go home at eight oclock. I watch TV at eight ten. I go to bed at nine oclock. I like playing computer games and going fishing. On Sunday morning, I usually do my homework. In the afternoon, I play games with my friends.

Once known as Changan, Xian is the political, economic, cultural and transportation center of Shaanxi Province, with its jurisdiction over five counties including Changan County. Located in the middle of the Central Plains of the Yellow River Basin, Xian stands between Qinling Mountain to the north and the Weihe River to the south. It is an important birthplace of the Chinese nationality as well as one of the places of human origin and prehistoric cultural centers in Asia. Its long history and rich cultural heritage has covered the old city with a mysterious veil.

As a world-famous ancient capital, Xian has been designated as the capital of 13 ancient Chinese dynasties such as the Western Zhou, Qin, Xihan, Xinmang, Eastern Han, Western Jin, Former Zhao, pre-Qin, post-Qin, Western Wei, Northern Zhou, Sui and Tang dynasties. Many important historical events took place here, such as the Red Eyebrow Peasant Rebellion at the end of the Western Han Dynasty (206BC-8AD), the Huangchao Peasant Rebellion at the end of the Tang Dynasty (618-907) and Li Zicheng Peasant Rebellion at the end of the Ming Dynasty (1368-1644) all once established temporary political powers in Xian. it also witnessed the famous Xian Incident in modern history. All these have left with Xian a lot of cultural relics. In Xian there are altogether 314 key cultural relics sites under protection, of which 84 belong to state or provincial level. Unearthed cultural relics reach 120,000, many of which are rare treasures in the world,

including the Stele Forest, the two Wild Goose Pagodas, the Clock Tower, the remains of Banpo Village and the city wall of the Ming Dynasty. In addition, there are ancient sites such as Han City, Tang City, Efang Palace, Weiyang Palace and Daming Palace, as well as the Huaqing Pond and pits of Qin Emperor Shihuangs Terra-Cotta Soldiers and Horses. Xian is a great place of revolution, and the Site of the Office of the Eighth Route Army can clearly demonstrate this. Located in Xian are also a number of universities and research institutions, including Xian Jiaotong University, Northwest University and Northwest Polytechnical University.

Xian is the biggest processing industrial base and the largest trade center in the central and western part of North China, as well as the starting point of the Silk Road. The Silk Road has become a wide road connecting China and other countries. It is a road to civilization, friendship, trade and cultural tourism.

Xian (Chinese:西安), is the capital of the Shanxi province in the Peoples Republic of China . As one of the oldest cities in Chinese history, Xian is one of the Four Great Ancient Capitals of China because it has been the capital of some of the most important dynasties in Chinese history,including the Zhou, Qin, Han, the Sui, and Tang dynasties. Xian is the eastern end of the Silk Road . The city has more than 3,100 years of history, and was known as Changan (traditional Chinese: 长安).

Long holidays are usual during Spring Festival, Labor Holiday (1-7 May), and National Holiday (1-7 October). The number of travellers is often greater during Summer (May-August), although the most pleasant season for visiting Xian is Autumn.

Xian (Chinese: 西安), is the capital of the Shanxi province in the Peoples Republic of China . As one of the oldest cities in Chinese history, Xian is one of the Four Great Ancient Capitals of China because it has been the capital of some of the most important dynasties in Chinese history,including the Zhou, Qin, Han, the Sui, and Tang dynasties. Xian is the eastern end of the Silk Road . The city has more than 3,100 years of history, and was known as Changan (traditional Chinese: 长安).

Long holidays are usual during Spring Festival, Labor Holiday (1-7 May), and National Holiday (1-7 October). The number of travellers is often greater during Summer (May-August), although the most pleasant season for visiting Xian is Autumn.

[英语作文介绍西安景点

My name is zhangyifan, this year 15-year-old boy, my special features is writing.I am an introverted person, very happy can spend a junior high school with everyone .I hope in the future day can spend amusedly with everyone for three years, increasing a perfect but substantial recollection for our lifes!

你的家乡在哪里呢?那里又什么样的风景?下面是语文迷整理的我的家乡英语作文，希望对你有帮助。

【第1篇】我的家乡英语作文

My hometown is beautiful place It stands near a wide river at the foot of low green hills. It has many tall buildings and wide streets. There are trees and flowers everywhere.

But it has not always been like that. In the old days, it was a sad dirty little town. Landlords and merchants lived in the few good houses. For the working people there were only dark, unhealthy rooms in old buildings and huts in narrow muddy streets. Nearly everyone was poor and many had no work.

Everything has changed since liberation. The people, led by the Party, have got rid of the mud and dirt. They have put up schools, theaters, shops and flats. They have an assembly hall and a hospital. Along the river they have built offices, hotels and parks. A lot of factories have sprung up. On the river, streamers and boats come and go busily, day and night. They carry the products of our industries to all parts of the country.

I love my hometown, and I love its people. They also have changed. Healthy and happy, they are going all out to build socialism.

我的家乡

我的家乡是个美丽的地方.它座落在一座不高的绿色山脚下,一条宽阔的河流边.有许多高耸的大楼和宽阔的街道.树木和花草随处可见.

但是它并不是一直如此.在旧社会,它是一个凄凉、肮脏的小镇.地主和商人住在几栋漂亮的房子里.劳动人民只能住在破旧、黑暗、不卫生的房子里或是狭窄、泥泞街道旁的茅屋里.几乎所有人都贫困,许多人没有工作.

解放后一切都改变了.在共产党的领导下,人民告别了泥泞和肮脏.他们建起了学校、剧院、商店和公寓,还有大礼堂和医院.沿河建起了办公大楼、宾馆和公园.许多工厂迅速涌现.河上汽船、小船日夜穿梭,他们将我们的工业产品运往全国各地.

我热爱我的家乡,我热爱家乡的人民.他们身上也发生了变化.他们健康、幸福,正在鼓足干劲建设社会主义.

【第2篇】我的家乡英语作文

My home town is a beautiful place. It stands beside a wide river and is rich in fish and rice.

But in the old days, it was a poor and backward little town. many people had no work. They lived a hard life.

In 1949 my hometown was liberated. Since then great changes have taken place there. The streets have been widened. factories, schools, hospitals, cinemas and theatres have sprung up one after another. The life of the people is greatly improved.

I love my hometown. All the more I love its people. They are working hard so as to make it still richer and more beautiful.

【第3篇】我的家乡英语作文

Hello, dear friends! Welcome to my village. Its big and beautiful! I like it very much. Look! There are many houses in the village. They are small. There are many high and beautiful mountains near the houses. There is a big forest behind the houses. There are many big trees in it. There are many rivers in front of the houses. The water is clean. There are many fish in the rivers. There are many bridges over the rivers. There are many big trees on the river banks. And there is grass and flowers on it. The grass is green. The flowers are colourful and beautiful. There is a lake in the village. There are many ducks in the lake. The sky is blue. The rivers flow. The air is fresh and clean. My village is very beautiful!I like it very much!

Setting off firecrackers whether be banned

Every barber knows that, is a way of expressing

，caused a lot of security Chinese festival in the Spring Festival,but due to set off firecrackers

issues.Therefore,Setting off firecrackers should be banned whether or not,becomestans a hot topic.

on the one hand,Have the Spring Festival firecrackers is the Chinese nation for thousands of years.As part of the Spring Festival Customs and Chinese civilization,and It must not be stopped.

On the other hand,Setting off substandard firecrackers and the operation is not standard it will cause an explosion,Resulting in injuries and economic losses,The gas it produces harmful to the environment,and Caused incalculable consequences.

In my opinion,We can set off some firecrackers,But we should pay attention to safety.only in this way,We can experience the fun of it.

My name is Jiao Rui. Im 9 years old. My birthday is May 16. Im a dog. My

weight is 95 Jin and my height is 143 cm. Im in grade 3 of Nanjing No.2 primary

school. My hair is black, my eyes are small, I am a single eyelid, my skin is

black. My mother said, "Im too fat.". I said, "although Im burnt and fat, Im

the fastest runner in my class. My favorite sport is swimming. shuttlecock. Play

football I like swimming best. I can swim six times in the natatorium. The coach

said I have made progress. I like not only sports, but also reading books. I

recommend Cao Wen to you

Introducing yourself is very important when you meet new people. You always want to make a good impression when telling others about yourself. Allow me to introduce myself.

My name is Pat and Im from Taiwan. Right now, Im a student. I study very hard every day. I like going to school because Im eager to learn. I enjoy learning English. Its my favorite class. I like to make friends and I get along with everyone. This is the introduction I give whenever I meet new people. It tells people a little bit about me and about what I like to do.

当你认识新的人时，介绍自己是非常重要的。你一定会想要在告诉别人有关自己的事，给别人留下好印象。让我来介绍我自己。

我的名字是派特，我来自台湾。我现在是学生。我每天都很用功念书。我喜欢上学，因为我渴望学习。我喜欢学英文。那是我最喜欢的课程。我喜欢交朋友，而且我和每个人都处得很好。这就是我每次认识新的人时，所作的自我介绍。它可以告诉别人一点关于我的事，还有我喜欢做什么。

Hello, my name is_______. I am_______  years old. Now I am studying in_______Primary School. I am in Grade _______, Class_______.

I live in_______. There are _______ members in my family—father, mother and me. My father is a_______ but my mother is working in _______. I love both of them.

In my spare time, I like  _______, and my favorite colour is_______. Also I love__________very much, such as ________________.

I hope I can learn English well, because I think it very important. But_______ is favorite subject, because it is very interesting.

I wish I can become a_______in the future.

Dear Sir/Madam:

My name is ××× , and I will graduate from Xian FanYi University in the year 2015, My major is secretary in English department.

It’s my great pleasure to have this opportunity to improve our mutual understanding. During the three –year college study, I tried my best to learn all kinds of knowledge, and weigh the hard work of my teachers and myself; I have mastered English listening, speaking, writing and reading skills.

Moreover, I have a good command of business English and the basic theory, public relationship of secretary. Meanwhile, in order to enlarge my knowledge, I always read some newspapers and magazines about business and trade, and I used to do some representative of business in my spare time. At the same time, I learnt computer skills during my summer vacation, and now Im familiar with Office 2007. It is my three –year college life that makes me form my life attitude. Also my three-year college life that makes me rich in knowledge, and its also my three-year college life that makes me form my life attitude. Honesty, Trust, Diligence is principle of how to be a man.

As a college graduate, I believe "where there is a will, there is a way", and I will try my best to do a good job in my business. So I sincerely hope that I can make a position in your company so that I can serve for the company in the future.

Yours faithfully,

[求职用英语自我介绍