要找到涉及许多复杂因素的新现象的原因远非一件易事。例如，一些科学家把环境的恶化归结为一些自然因素，而另一些人把责任都推在人类不适当的行为上。
2. One doesnt have to look far to realize the direct correlation between smoking and cancer .
人们不用花费很大力气就能发现抽烟和癌症之间的直接联系。
3. State-owned enterprises are not only failing because of inefficient management , but also because of their inability to awitch operational modes from the former planned economy to the new market economy .
国有企业失败不仅由于低效的管理，也因为他们不能实现从以前的计划经济到新的市场经济的运作模式的转换。
4. The reasons for antisocial behavior are both complicated and varied . I suggest the phenomenon results from inappropriate role models and the lack of well-defined norms of behavior . However , the main reason is quite likely the continuing degeneration of social values .
反社会行为的原因既复杂又多样。我认为这种现象是不恰当的角色典型和缺少行为规范的很好的定义造成的。然而，主要原因很可能是不断贬低的社会价值。
5. The causes of racial hatred are not readily definable . Sociologists , however , attribute them to the misguided concept of a superior race and an innate mistrust of people of color . Perhaps the main cause is quite simply ignorance .
种族仇恨的起因没有现成的答案。然而，社会学家把原因归结为被误导的更高贵的种族的观念以及天生的对有色人种的不信任。主要原因可能仅仅是因为无知。
6. The scourge of HIV/AIDS currently engulfing the world will quite likely be brought under control within the next few years thanks to the untiring efforts of scientists and researchers worldwide .
现在席卷世界的艾滋病的祸害很有可能由于全世界科学家和研究人员的不懈努力在未来几年内得到控制。
7. The incidence rate of cancer mainly stems from several factors , including inappropriate diets , poor healthcare practices and the lack of early detection . Continuing medical advances and rising awareness do , however , offer promising hope for the future .
癌症的发病率主要由以下诸多因素引起，包括不适当的饮食、不好的保健习惯以及没有及早发现。然而，医学的不断进步和对此不断增强的关注给未来带来了很大的希望。
8. Increased urban pollution levels and the mounting death toll from motor vehicles accidents can mainly be attributed to the glut of automobiles appearing on city roads in recent years . Detrimental factors will quite likely outweigh the benefits of rising automobile usage .
城市人口的增长和车祸中死亡率的增加主要是由于近年内充斥城市道路的汽车。汽车使用量的增加带来的有害因素很有可能超过它的好处。
9. The rising divorce rate in China can , at least in part , be attributed to spousal incompatibility , disparities in education levels , changing social attitudes and the increasing upward mobility of the younger generation .
中国上升的离婚率可以，至少部分可以归结为婚姻的不和谐，受教育水平的差异，变化的社会看法以及年轻一代不断增强的上进心。
1. It seems certain that they have made a series ofexperiments.
2. It is said that bats have been using radar formillions of years.
3. To tell the truth , many mistakes we made could havebeen avoided.
4. As we know, it was not until recently that the problemwas solved.
5. It must be admitted that you haven't done what youpromised to do.
6. It is a common saying that man who has a settledpurpose will surely succeed.
7. It is clear that the enemy has no desire for peace.
8. It is hard to imagine how Edison managed to worktwenty hours each day.
9. It's hard to say whether the plan is practicable.
10. There is no doubt that you will be helped by othersif you have any difficulties.
11. The oceans do not so much divide theworld as unite it.
12. There is no denying the fact that the new managementmethod has greatly increased the production.
13. There is no denying the fact that the new managementmethod has greatly increased the production.
14. Upon hearing the unexpected news, he was so surprisedthat he couldn't utter a word.
15. As the saying goes, nothing in the world is difficultfor one who sets his mind to it.
16. In my opinion, this computer is different from thatone you saw.
17. It is certain that we have a long way to go.
18. All this shows that nothing can prevent us fromreaching our aims.
19. As far as we know, it took him more than a year towrite the book.
20. It has been proved that every substance, no matterwhat it is, is made up of atoms.
21. It must be pointed out that it is one of our basicState policies to control population growth while raising the quality of thepopulation.
22. It is (has been) estimated that the world'spopulation could reach 6 billion by the end of the century.
23. It must be kept in mind that there is no secret ofsuccess but hard work.
24. It can be seen from this that there is no difficultyin the world we cannot overcome.
25. As is known man is the product of labour.
26. Our goal must be attained. Our goal canunquestionably be attained.
27. Noting can prevent us from realizing the fourmodernizations.
28. Now in China, more and more families can afford tobuy high-grade goods, such as washing machines, TV sets, videocorders.
29. No matter how difficult English may be, you should doyour best to learn it.
30. It can be said that without knowledge of science andtechnology, it is impossible to build socialist modernizations.
31. It has been decided that we are going to build arailway whose base must be completed within this year.
32. It is obvious (evident) that the success of theinnovation depends on our concerted efforts.
33. To be frank, whether you like it or not, you have noother choice.
34. It is natural that one may have trouble expressingcomplicated ideas in simple English.
35. What is more important, the agreement they havenegotiated is being carried out.
36. We will be successful as long as we persevere.
37. Frankly speaking, what you call the truth may notapply to things happening here.
38. It is true that we must redouble our efforts;otherwise we cannot catch up with the developed countries.
39. I take it for granted that they will support thisidea.
40. In a certain sense, a successful scientist is aperson who is never satisfied with what he has achieved.
学生在写作文的时候，有时候提笔不知道怎样写什么，或者不知道应该怎样用英语准确的表达自己的`意思。如果有这样的情况，我建议大家可以多准备一些例句，注意最重要的是你要知道怎样才能利用好这些例句。
They will not ,he believes, get the health benefits without putting sufficient time into their exercise.这个句子是有关身体健康的句子，我们可以换几个词，就会变成别的。
win a place as 占有一席之地
The long-term trends lend support to the optimistic view
give sb an edge over sb 给予.....竞争的优势
The things that they catch or miss often determine whether a game will become a top seller or a failure.
The ugly advertisement is a blot on the beautiful landscape.
Various controversy have arisen in the university over this question.
Whether or not a part-time job is useful for a students future depends on the type of job chosen.
这些是比较经典的句型，记住要会灵活运用，才可以举一反三，下笔的时候就会很轻松了。
