大学英语演讲稿500词实用20篇

1. at the thought of一想到…

2. as a whole (=in general) 就整体而论

3. at will 随心所欲

4. (be) abundant in(be rich in; be well supplied with) 富于，富有

5. access(to) (不可数名词) 能接近，进入，了解

6. by accident(=by chance, accidentally)偶然地，意外. Without accident(=safely) 安全地，

7. of ones own accord(=without being asked; willingly; freely)自愿地 ,主动地

8. in accord with 与…一致 . out of ones accord with 同…。不一致

9. with one accord (=with everybody agreeing)一致地

10. in accordance with (=in agreement with) 依照，根据

11. on ones own account

1) 为了某人的缘故， 为了某人自己的利益

2) (=at ones own risk) 自行负责

3) (=by oneself)依靠自己

12. take…into account(=consider)把..。考虑进去

13. give sb. an account of 说明， 解释 (理由)

14. account for (=give an explanation or reason for) 解释， 说明。

15. on account of (=because of) 由于，因为。

16. on no account(=in no case, for no reason)绝不要，无论如何不要(放句首时句子要倒装)

17. accuse…of…(=charge…with; blame sb. for sth. ; blame sth. on sb. ; complain about) 指控，控告

18. be accustomed to (=be in the habit of, be used to)习惯于。

19. be acquainted with(=to have knowledge of) 了解; (=to have met socially) 熟悉

20. act on 奉行，按照…行动; act as 扮演; act for 代理

21. adapt oneself to(=adjust oneself to) 使自己适应于

22. adapt…(for) (=make sth. Suitable for a new need) 改编， 改写(以适应新的需要)

23. in addition (=besides) 此外， 又， 加之

24. in addition to(=as well as, besides, other than)除…外

25. adhere to (=abide by, conform to, comply with, cling to, insist on, persist in, observe, opinion, belief ) 粘附; 坚持， 遵循

26. adjacent(=next to, close to) 毗邻的， 临近的

27. adjust..(to) (=change slightly)调节; 适应;

28. admit of (=be capable of, leave room for) …的可能，留有…的余地。

29. in advance (before in time) 预告， 事先

30. to advantage 有利的，使优点更加突出地

人生的过程中尽管不无遗憾，但我学到最价值连城的一课——逆境和挑战只要能激发起生命的力度，我们的成就是可以超乎自己所想像的。

我成长的年代，香港社会艰苦，是残酷而悲凉的。那时候没有什么社会安全网，饥饿与疾病的恐惧是强烈迫人。求学的机会不是每一个人的权利，贫穷常常像一种无期徒刑。今天社会前行，新的富足为大部分人带来相对的缓冲保障，贫穷不一定是缺乏金钱，而是对希望及机遇憧憬破灭的挫败感。很多人害怕可上升的空间越来越窄，一辈子也无法冲破匮乏与弱势的局限。我理解这些恐惧，因我曾经一一身受。没有人愿意贫穷，但出路在哪里?

七十年前这问题每一个晚上都在我心头，当年十四岁时已需要照顾一家人，没有接受教育的机会，没有可以依靠的人脉网路，我很怀疑只凭刻苦耐劳，和一股毅力，是否足以让我渡过难关?我们一家人的命运是否早已注定?纵使我能餬口存活，但我有否出人头地的一天?

我迅速发现没有什么必然的成功方程式，首要专注的是，把能掌控的因素区分出来。若果成功是我的目标，驾驭一些我能力内可控制的事情是扭转逆境十分重要的关键。我要认清楚什么是贫穷的枷锁—我一定要有摆脱疾病、愚昧、依赖和惰性的方法。

比方说，当我发觉染上肺结核病，在全无医疗照顾之下，我便下定决心，对饮食只求营养不求喜恶、适当地运动及注重整洁卫生，扞卫健康和活力。此外，我要拒绝愚昧，要持恒地终身追求知识，经常保持好奇心和紧贴时势增长智慧，避免不学无术。在过去七十多年，虽然我每天工作十二小时，下班后我必定学习，告诉你们一个秘密，在过去一年，我费很大的力气，努力理解进化论演算法里错综复杂的道理，因为我希望了解人工智慧的发展，以及它对未来的意义。

无论在言谈、许诺及设定目标各方面，我都慎思和严守纪律，一定不能给人嚣惰脆弱和倚赖的印象。这个思维模式不但是对成就的投资，更可建立诚信;你的魅力，表现在你的自律、克己和谦逊中。

所有这些元素连接在一起功效非凡：它能渐渐凝聚与塑造一个成功基础，帮助你应付控制范畴以外的环境。当机遇一现，你已整装待发，有本领和勇气踏上前路。纵使没有人能告诉你前路是什么一道风景，生命长河将流往何方，然而，在这过程中，你会领悟到邱吉尔多年的名言：“只要克服困难就是赢得机会。一点点的态度，但却能造成大大的改变。”

生命抛来一颗柠檬，你是可以把它转榨为柠檬汁的人。要描绘自己独特的心灵地图，你才可发现热爱生命的你、有思维、有能力、有承担，建立自我的你;有原则、有理想，追求无我的你。

[高考作文素材：贫穷造就了作家

I am Andrea. Perhaps the word "average" can best describe me. I am of average heigHt, average weight and of average complexion. I have a thin face, double-lid eyes and a pointed nose. My hair is black, short and straight. I have never worn my hair long.I look like both my mother and

my father, but I have inherited their best parts.

lam a teacher, and I like my job. I believe her or his students can sometimes teach a teacher. Actually I have learnt a lot from my own teaching experience and my students. One particularly good thing about being a teacher is that I am learning something new each day and thus making progress each day. This is wonderful. Of course the income is modest, but on the other hand, quite stable. I keep growing all the time. I find great rewards both monetarily and mentally.

I have many hobbies: reading books, raising pets, making dresses, etc. I like volleyball very much, but I cant play it very often, because it is a team sport. It is difficult to get enough people to play volleyball with me. Its a shame. I derive great pleasure out of my hobbies.

Generally speaking, I am open, honest and easy-going. I hate hypocrisy and injustice. Fairness is very important to me. I try to be fair in everything I do. I have great appreciation for physical and spiritual independence. I am a bit disorganized and impatient sometimes.

I dont have many friends, but I do have a few. I have both male and female friends. We do sports together, go shopping together; and we exchange our views and ideas and share happiness and sadness. Of course we help each other if necessary. I always consider myself a lucky person. I am lucky in my family, I am lucky in my career, I am lucky in my friendship, I am lucky in many things. In one word, I am lucky in life. I am really grateful for all these.

我叫安德里亚。也许“平凡”一词最能形容我。我中等身材，不胖也不瘦，不白也不黑。我有一张瘦削的脸，双眼皮，翘鼻子，我乌黑的头发又短又直，我从未留过长发。我长得既像妈妈又像爸爸，不过我继承了他们的优点。

我现在是一名教师，我热爱我的工作。我认为，一个老师有时也能从他(她)的学生那儿学到知识。事实上，从我的教书经历，从我的学生们那里，我学到了许多许多。 当老师特别好的一点就是每天我都在学习新的东西，并因此而每天取得进步。这真是棒极了。 当然，收入并不高。然而，换个角度看，收入却是相当稳定的。我一直都在不断进步成长，在金钱方面与精神方面我都得到丰厚的回报。

我的兴趣爱好广泛，比如：读书，养宠物，制作服装，等等。虽然我非常喜欢打排球，但是由于这是一项团队运动，我不能经常去打。要找到足够多的人同我一起打排球是很难的。真遗憾!兴趣爱好给我带来无穷的乐趣。

总的说来，我是一个外向、诚实而随和的人。我对任何虚伪和不公正都深恶痛绝。我极为珍视公平公正，对于所做的每一件事，我都尽力做到公平。我崇尚物质上和精神 .

Should we help strangers

Recently,accroding to the report that is a child to help a older man who fall down.unfortunely,the older man is a bad cheater,he pretented.The report pays a lot of people attention.

There are different opinions among people as to   should we help strangers,some people suggest that is a virtue.As we all know a words said that help others is help yourself.

Another thinks that it likely would take trouble to their life.Its very dangerous.They rather than accept social critizise.

As far as I am concerned,I agree with first opinion.I believe that someone should be help with me.Whatever the social change,I still do that I think right things and never change.We help strangers,on the same time,we would potect ourself.

Life in the university is not as satisfactory as what we had expected.

First of all, we are tightly hound by continual classes, excessive homework and exams; some students complain that we are becoming "exam machines". Secondly, the teaching method is boring; instead of lecturing, some teachers just "read" lessons. Finally, living conditions need to be improved; and food in the dining-hall is far from being attractive and tasteful.

In spite of all these adversities we still enjoy our life in the university. During the four-year university study, we can not only acquire a lot of book learning, but also foster various abilities. All types of extracurricular activities such as sports meets, speech contests, different social gatherings and dancing parties provide opportunities to make friends; many of these friendships may last a long time.

In short,we should value our life in the university. Four years is only a short period when compared with our whole lifetime. In the university we mature, and in the university we prepare ourselves for the real world. Although there are many

things lacking, the four years in the university is a worthwhile period in our whole lifetime.

[大学生活的英语作文

Thanksgiving which falls on the fourth Thursday of November, is one of the

biggest American holidays. This holiday started in the early 1600s after

settlers arrived in America. These people who came from Europe didnt know how

to survive in the wild new country. Luckily, they met some friendly American

Indians, who showed them how to hunt turkeys and grow corn. In the fall, after

the harvest, the settlers had a great feast. They invited the Indians to thank

them for their help. Today the tradition continues. On Thanksgiving Day,

Americans invite their friends over for a turkey dinner and give thanks for what

they have.

After entering college, we found, to our surprise, that differences between high school life and college life are great. In high school, we always depended on our parents and teachers to solve all kinds of difficult problems. At college, however, we have to rely exclusively on ourselves. Whats more, we have to learn how to get along with our classmates and roommates.

Four years at college is an important yet very short period of time in our life. So it is always expected that we adapt to this life as quickly as possible. But it is a pity that not everyone can do so immediately. Here are some suggestions.

First, get familiar with the main buildings on the campus. Spend one or two hours by yourself or with your classmates to go around the campus so that you can know the location of such important places as the library, the dining room, the post office, the clinic and classrooms. Next, try to be independent. Learn to do such things as making sound decisions on how to spend your time, how to spend your money etc, and washing clothes on your own. Furthermore, form good study habits. Talk with your classmates and learn from their good habits. Finally, try to take part in all kinds of activities to get out of your solitude and get on well with your classmates.

many senior school students (高中生) are faced with the headache choice between big universities and small ones。 apart from different requirements， each has advantages and disadvantages。

if you ask me what my preference is， my answer is that i would like to go to a big university。 a big university attracts me for sound reasons。 more qualified teaching staff， higher aims and better conditions are helpful to students studying there。 what is more， various lectures organized by more colleges (大学里的学院) and departments make students in different majors form all round opinions on things。 and diverse activities enrich students life after school。 additionally， a big garden campus provides a satisfying environment for studying and living for four or more years。

though more students might mean more competitions， though i might be a small fish in a big pond， i will be motivated to work harder。 in a big university， i believe， my visions will be broadened， and my college life will be a more fruitful and colourful one。 in word， i am inclined (倾向于) to study in a big university。

[高中生怎样选择大学英语作文

After completing my military service, I have been looking for a challenging goal for me to achieve. And I found that the Intermediate of General English Proficiency Test fits my new achievement properly.I graduated from Taipei Commercial Junior College, majored in business administration. Instead of spending much time in playing, I devoted myself to my studies and paid attention to all meaningful things happened in daily life. By the way, I learned a lot from Mr. Wang, the professor of my business class. He is my good friend till now an often gives some appropriate suggestions toward my problem confusion.My father is, in the same way, a good consultant to me. As he said: I am in poor education, little for you; to clarify, what he have given is far beyond his words, I do think so. I was born in a country of Ping Tung Country, farming is our career of generations. There are four people in my family, Mother is housewife and my brother is a student of an Agriculture CollegeI am optimistic and active, and I am confident that I can pass the test. Thank you for your precious to read my autobiography.

It is quite often seen that many students walk their pets on campus nowadays. For the owners, it is really good enjoyment and happiness. But for the other students, it may not so good. As more and more students bring their pets to campus, a cry for forbidding the pets brought to campus is higher and higher. For me, I think the owner shouldn’t take their cute pets on campus for the sake of clean.

现在，大学生在校园里遛宠物是一件很常见的事情。对于宠物主人来说，这肯定是一件很惬意和幸福的事情。但是对于其他的学生来说，却不是那么好。禁止在校园里养宠物的呼声随着越来越多的学生在校园里养宠物也越来越高。就本人来说，从整洁的角度来考虑，我认为学生不应该带他们的爱宠来学校来养。

Firstly, keeping pets in dormitory will make dormitory smell bad and cause noise pollution. Pets couldn’t go to toilet and flush their waste as human does, so they just urine everywhere, which makes the place smelly. Besides, pets can make lots of noisy which is annoying especially at night. For other students who live with the owner, it is absolutely a disaster for they have to suffering from both the terrible smell and the disturbing noise.

首先，在宿舍里养宠物会让宿舍里面很难闻，并且会引起噪声污染。宠物并不会像人类一样可以自己去厕所并冲走它们的排泄物，它们到处大小便会让宿舍里面有很大的味道。另外，宠物会制造出很多恼人的噪音，尤其是在夜间。而对于同居一室的其他舍员来说无疑是一场灾难，他们不得不忍受那些难闻的气味与烦人的噪音。

Secondly, raising pets can be time-consuming and even affect their study. For students, they are supposed to spend more time studying. If they put their focus on their pets, then they will have less time to study. Not to imagine that they will do good in their study.

其次，养宠物很浪费时间甚至会影响学生的学习成绩。作为学生，应该多花时间在学习上。如果学生把精力都花在宠物的身上，那么学习的时间会更少。更不用说他们的学习成绩会好到哪里去。

In conclusion, I don’t think it is good for students to raising pets on campus in consideration to the good of the public hygiene and also their improvement in their academic performance.

总之，考虑到学校的公共卫生和学生的学习成绩，我不认为在学校养宠物会对学生有好处。

New life begins! Ive been expecting this moment for a long time.Finally,I become a college student .

All good things must come to an end ! I am now apart from my family members and many good friends.I am awared that I will have to do everything on my own .

Being responsible is the exact thing that I am supposed to think about! Im now dealing something responsibly with my new rommates.I enjoy being together with them,they just like my good friends in high school,being kind and thoughtful !

My college is a place for a new beginning ,Im sure Im taking a new life ,everything here is full of challenge,quite different from things in high school,teachers are not going to tell you exactly what you are going to do ,you will have to make your own decisions.

So far,Im geting along so well with people aroud me ,college provides me with chances and challenge,Im going to make a difference to my life!And I have every confidence on myself.I will still have to move on......

新生活开始了!我一直期待这一刻很久了。最后,我成为一个大学生。

所有美好的事物都必须结束!我现在除了我的家人和许多好朋友。我知道我要做我自己的一切。

负责的事情我应该思考!我现在负责任的事情处理我的新室友。我喜欢和他们在一起,他们就像我的好朋友在高中的时候,仁慈、体贴!

我的大学是一个新的开始,我敢肯定,我的新生活,这里的一切都充满了挑战,完全不同于高中,老师不会告诉你要做什么,你必须自己做决定。

到目前为止,我真好我很好与人有关,大学给我提供了机会和挑战,我要改变我的生活!我对自己有信心了。我仍将继续……

I am ****. Usually a lot of my hobbies, such as skating, playing 356 Didesmococcus feather, draw, watch extra-curricular book, watch TV and so on, so my life is very rich extra-curricular. Ago is a more introverted person, I have very few words, only and I am very good friends to so many before, but after school at the time of my personality to change slowly, and not, as previously Like very few words, and students are also very harmonious relationship.

In fact, since childhood I dare not interested in English, so my English very poor, then let us hear English, introduce myself, I really do not know how to do, nervous for some time, so I think in the future of English class can have more understanding of English can have more interest in English. Families are. Usually a lot of my hobbies, such as skating, playing 356 Didesmococcus feather, draw, watch extra-curricular book, watch TV and so on, so my life is very rich extra-curricular. Ago is a more introverted person, I have very few words, only and I am very good friends to so many before, but after school at the time of my personality to change slowly, and not, as previously Like very few words, and students are also very harmonious relationship.

I think noting is difficult if you put your heart into it,so I can say will make my English be nice in future.

Thank you！

Dear Mr. Zhang, Because I have got a cold and high fever. The doctor adviced me to rest for several days. I will attend school as soon as possible. And you dont worry about my work, I will ask my classmates to help me with it once I am back.

I hope my absence will not cause you any inconvenience.

Sincerely,

xiao Li

Dear Sir / Madam :

Hello!I was a senior at Hunan Normal University, students going into the  community, I was full of expectation for the future.I believe, Well begun is  half done (good beginning is half the success).I hope your company is the  starting point for my success that I can, together with your company to create a  brilliant tomorrow.

I was born in the border town of scenic rivers -- Riverside.outstanding  performances in 2003, I admitted to the Hunan Normal University School of  Economics and Management, and thus opened a new chapter in my life.School  classes since I have been secretary of the corporation, not only the heavy  workload of my job training and tempering,I have the ability to solve problems  more tempered, I can calmly analyze the problems faced and thoughtful.And all of  this to my professional choice will have a profound impact.

I do our own work, the school also took an active part in the various  activities, and to encourage students to participate,for their advice; In daily  life, I was able to closely unite students, I believe that a collective effort  is a powerful,Only when we engage in, we can all work.The socialist  modernization drive is comprehensive quality management talentsSo I learn  professional knowledge, the main English andcomputers, in English, I cultivation  my hearing, said,Reading, writing ability; in the computer, I start from the  basic knowledge, and further understand the function of the OFFICE,INTERNET also  studied the basic knowledge can be used flexibly.

End professional after the election, in order to broaden their knowledge, I  also participated in the study and computerized accounting.mastered the basic  application and Excel and other accounting software applications.To make their  professional knowledge to mastery learning, I read a textbook case of the  MBA,such as strategic management, corporate governance, financial management and  capital operation, and to use their training to work.With Love width of the sea,  the days of His Career, I hope that your company can give me a chance to display  his talent.I will work hard, study hard expertise to the company to live up to  my expectations.

On Water Shortage

No one can have failed to notice the fact that water shortage is a grave problem with which the whole world is confronted. Actually, it has become so widespread that it has severely affected peoples daily life and hindered the development of the global economy.

A number of factors could account for the problem, but the following might be the critical ones. First, with the development of agriculture and industry, an increasing amount of water is needed. Secondly, the ever-increasing population is another leading cause of water shortage. Besides, the global tendency of warming up also contributes to the problem. Whats worse, pollution and waste of fresh water aggravate the situation.In view of the seriousness of the problem, effective measures must be taken before things get worse. First, it is essential that laws and regulations be worked out and enforced to protect water resources. Secondly, people should enhance their awareness of saving water. With these measures taken, it is reasonable

for us to expect a brighter future.

First, I’ll say something about World Expo History. As we know, the very first World Expo, the Great Exhibition of 1851, took place in the Crystal Palace in London. UK. Ever since then, the goals of World Expos have been both high-minded as well as commercial. Visitors are able to explore the world outside of their everyday experience—outside cultures, new scientific advancements, and new inventions. World Expos have excited and inspired more and more people in the world

On December3, 2002, the Bureau of International Expositions (or call it BIE) announced that Shanghai will host Expo2010. the BIE had received bids from five cities to host Expo2010. Among the 5 nice cities, the BIE chose Shanghai at last! It’s really an exciting news for not only Shanghainese, but also all of Chinese people. Here are some details about it.

Loot at this profile carefully. The title is “The 2010 World Exposition ,Shanghai, China ”。 this is the logo.

And the theme is “better city., better life”。OK, let’s guess who is the image representative? Yeah, you’re right, Yao Ming!

Shanghai Expo is the first comprehensive World Expo held in a developing country. And it is also the first one that takes “the city” as its theme, hoping that it can push forward the city development and help bring about a better urban living environment, just like the theme: better city, better life.

I think, as a student in Shanghai, we should learn to be a gentle person and keep good manners from now on. And try to practice English more in order to communicate with foreigners fluently in the near future. Because, we’re a part of Shanghai!

On the Losing of Traditional Culture

1. 现在许多传统文化正慢慢消失

2. 传统文化消失的原?因

3. 我的看法

On the Losing of Traditional Culture

It is widely noted that lots of traditional culture is disappearing along with the development of technology. Many ancient architectures and traditional ways of living have been deserted. It seems that the traditional culture and craftsmanship will be replaced in this modern era.

The following reasons can account for the above phenomenon. Firstly, traditional technologies are always considered ineffective while the new sciences are always highly efficient. Secondly, it is costly to protect the traditional culture. If the fund used to protect the ancient culture was instead delivered to the poor, it will be helpful to the improvement of their living standard. Thirdly, modern science and technology facilitate both our daily and academic life a lot. For instance, college students always collect their thesis materials by surfing the Internet instead of borrowing books from the library.

In my opinion, although traditional culture is an ancient heritage, it couldn’t keep pace with the development of society. It is the tide of history that the traditional culture and technology will no doubt be eliminated in the end.

mr shao taught me english when i was in senior three.with the bald head and hunchback, the fifty or some man distinguished himself from his counterparts in many ways.

he was so addicted to tobacco that he couldnt even skip acigarette in the corridor at the interval between two classes. due to the long time consumption of cigarettes, his teeth had gone totally bad and occasionally let off unpleasant smell which really disturbed us when we were talking to him. at times, he came to recognize it and consequently found out a solution. he suggested we write down our problems and he answer them in the written form. although i knew all along that he was a careful man, his quotations of five different dictionaries on a single multiple choice problem was still beyond my wildest dream.

whats more, none of us could imagine how ecellent his ancient chinese literature was. what he tended to do in his class was to recite several segments of the famous ancient prose and then put them into english. however, under the pressure of college entrance eam, the students didnt seem to be so interested in his performance. therefore, he tried to stimulate the class by editions of times as prizes for answering questions. it worked on us instantly.

on the day of the entrance eam, he waited nervously with us out of the eamination room. he kept reminding us not to drink water in case that we would feel like going to toilet during the eam. not withstanding his constant claims that we students were far less important than his beloved daughter, we did feel his devotion to us.

No classical work could pervade every cubic centimeter of air with such cultural fragrance but she.

No judicious sage could merge various elements as a magnificent poem but she.

No green tree could consist of vivid cells arousing every hearts anxiety for being young forever but she.

She is my university Fudan University.

The first time I entered the campus as a freshman, I was deeply attracted by her cultural atmosphere and historical connotation. Fudan is a graceful lady who is accustomed to serenity but meanwhile each action of hers outpours her innermost tern perament. Apparently it is worth every effort to probe into her world for the sake of both physical and mental enrichment. Her humanistic spirit inspires me to care for everything around, even the most trivial one.

On the other hand, catching up with the times, Fudan is modern and smart. You see, the many age-old buildings here are actually great libraries and labs. Scientific and technological developrnent is easily smelt in the air,because she never lags behind the world.

Fabulously, such a historical and scientific school is far more than an operational mechanism. Her everlasting youth and vigor beam through every corner of the campus and the young in school vivify every piece of concrete and wood here. What makes me happy and strong is that it perpetuates me with unfading energy. And it is definitely beneficial for me to be granted enthusi。

China has often been criticized for the rampant practice of software piracy. Take a look around. We operate on pirated Windows systems, defend PC security with pirated Kaspersky anti-virus programmes, process files with pirated Microsoft Office, draft 3D designs with pirated AutoCAD, refine pictures with pirated Adobe Photoshop, and study English with pirated Kingsoft’s electronic dictionaries and translators. It’s no exaggeration that pirated software is everywhere。

The logic behind the phenomenon is simple and clear: if a pirated copy is available for just a tiny fraction of the normal price, not to speak of many of the free downloads online, who would pay for an authentic copy? Cheaper prices aside, easy access is another important factor. With such a large gathering of pirated upgrades around, who would bother to spend time and money searching the stores for an authorized yet outdated version?

Despite these apparent benefits, the practice of software piracy should be banned, because it represents unfair competition and by nature it’s a no-win situation. But how? Two approaches are to be taken at the same time: Technically, software developers should enhance their antipiracy engineering, so that cracking the software should be virtually impossible. And legally, the government should also tighten its antipiracy laws and toughen up the penalties, so that violations should be costly。

How to protect our environment

We all know it is becoming more and more important to protect our environment well.We should stop cutting down trees ,dropping litter everywhere and throwing waste before it is processed. It has caused lots of problems such as much rich land becomes desert;Rivers become dirty ;The air is becoming worse and worse ;The temperature is becoming hotter and hotter.So we must do something to change the situation.Wed better walk or ride bikes to work or go to school instead of driving a car,We mustnt use plastic bags.Our government must take some measures to prevent factories producing smoking etc.

[关于环境污染的大学英语作文