千羽YUmi
一、用于作文开头的万能模板：1、Many people insist that... 很多人(坚持)认为……2、With the development of science and technology, more and more people believe that... 随着科技的发展,越来越多的人认为……3、A lot of people seem to think that... 很多人似乎认为……二、引出不同观点的万能模板：1、People's views on... vary from person to person. Some hold that... . However, others believe that.... 人们对……的观点因人而异。有些人认为.....然而其他人却认为……2、Attitudes towards (drugs) vary from person to person. 人们对待吸毒的态度因人而异。3、People may have different opinions on... 人们对……可能会有不同的见解。4、There are different opinions among people as to... 关于……人们的观点大不相同。5、Different people hold different attitudes toward (failure). 对(失败)人们的态度各不相同。三、得出最终结论的万能模板：1、Taking all these factors into consideration, we naturally come to the conclusion that... 把所有这些因素加以考虑，我们自然会得出结论……2、Taking into account all these factors, we may reasonably come to the conclusion that... 考虑所有这些因素，我们可能会得出合理的结论……3、Hence/Therefore, we'd better come to the conclusion that... 因此，自然我们得出以下结论。。。4、There is no doubt that (job-hopping) has its drawbacks as well as merits. 毫无疑问，跳槽有优点也有缺点。5、All in all, we cannot live without... But at the same time we must try to find out new ways to cope with the problems that would arise. 总之，我们没有……是无法生活的。但同时，我们必须寻求新的解决办法来对付可能出现的新问题。这句话一般用于作文结尾，属万能句式，句式较为简单，方便操作。四， 提出最终建议的万能模板1、It is high time that we put an end to the (trend). 该是我们停止这一趋势的时候了。2、It is time to take the advice of ... and to put special emphasis on the improvement of ... 该是采纳……的建议，并对……的进展给予非常重视的时候了。3、There is no doubt that enough concern must be paid to the problem of ... 毫无疑问，对……问题应予以足够的重视。4、Obviously,.... If we want to do something... , it is essential that... 显然，如果我们想做某事，我们需要……5、Only in this way can we... 只有这样,我们才能...6、It must be realized that... 我们必须意识到...
阿优米酱
在英语写作中，通用模板尤为重要，因为当你记不起单词或者不知道怎么写的时候，这时候套个通用模板，一样也能得分，也不至于零分，虽说是通用模板，但也都是由句子组成的，下面是我为您收集整理的备考指导：大学英语四级写作九类精彩句型，供大家参考!
备考指导：大学英语四级写作九类精彩句型
一)比较
1.The advantage far outweigh the disadvantages.
2.The advantages of A are much greater than those of B.
3.A may be preferable to B, but A suffers from the disadvantages that...
4.It is reasonable to maintain that ...but it would be foolish to claim that...
5.For all the disadvantages, it has its compensating advantages.
6.Like anything else, it has its faults.
7.A and B has several points in common.
8.A bears some resemblances to B.
9.However, the same is not applicable to B.
10. A and B differ in several ways.
11. Evidently, it has both negative and positive effects.
12. People used to think ..., but things are different now.
13. The same is true of B.
14. Wondering as A is ,it has its drawbacks.
15. It is true that A ... , but the chief faults (obvious defects )are ...
二)原因
1.A number of factors are accountable for this situation.
A number of factors might contribute to (lead to )(account for ) the phenomenon(problem).
2. The answer to this problem involves many factors.
3. The phenomenon mainly stems from the fact that...
4. The factors that contribute to this situation include...
5. The change in ...largely results from the fact that...
6. We may blame ...,but the real causes are...
7. Part of the explanations for it is that ...
One of the most common factors (causes ) is that ...
Another contributing factor (cause ) is ...
Perhaps the primary factor is that …
But the fundamental cause is that ...
三)后果
1. It may give rise to a host of problems.
2. The immediate result it produces is ...
3. It will exercise a profound influence upon...
4. Its consequence can be so great that...
四)批驳
1)It is true that ..., but one vital point is being left out.
2) There is a grain of truth in these statements, but they ignore a more important fact.
3) Some people say ..., but it does not hold water.
4) Many of us have been under the illusion that...
5) A close examination would reveal how ridiculous the statement is.
6) It makes no sense to argue for ...
7) Too much stress placed on ... may lead to ...
8) Such a statement mainly rests on the assumption that ...
9) Contrary to what is widely accepted, I maintain that ...
五)举例
1) A good case in point is ...
2) As an illustration, we may take ...
3) Such examples might be given easily.
4) ...is often cited as an example.
六)证明
1) No one can deny the fact that ...
2) The idea is hardly supported by facts.
3) Unfortunately, none of the available data shows ...
4) Recent studies indicate that ...
5) There is sufficient evidence to show that ...
6) According to statistics proved by ..., it can be seen that ...
七)开篇
1) Many nations have been faced with the problem of ...
2) Recently the problem has been brought into focus.
3) Recently the phenomenon has become a heated topic.
4) Recently the issue has aroused great concern among ...
5) Nowadays there is a growing concern over ...
6) Never in our history has the idea that ... been so popular.
7) Faced with ..., quite a few people argue that ...
8) According to a recent survey, ...
9) With the rapid development of ..., ...
八)结尾
1) From what has been discussed above, we can draw the conclusion that ...
2) It is high time that strict measures were taken to stop ...
3) It is necessary that steps should be taken to ...
4) In conclusion, it is imperative that ...
5) There is no easy method, but ...might be of some help.
6) To solve the above-mentioned problem, we must ...
7) In summary, if we continue to ignore the above-mentioned issue, more problems will crop up.
8) With the efforts of all parts concerned, the problem will be solved thoroughly.
9) We might do more than identify the cause ; it is important to take actions to ...
10) Taking all these into account, we ...
11) Whether it is good or not /positive or negative, one thing is certain/clear...
九)
1)With the deepening of Chinese reform and opening up
2)When it comes to...，some people think /believe……that...，others argue /claim that opposite /reverse is true.There is probably……some truth in both arguments/statements，but...当说到……，有些人认为……，但另一些人则持相反的观点……。这两种观点可能都有点道理，但……
热点范文
Direction:
A. Write an essay that conveys the information in the following cartoon accoMPAnied by your comments.
B. Word Limit: about 200 words
C. Your eassy should be written clearly on ANSWER SHEET 2
营生 祖上以打猎为生
爷爷以卖上等木材为生
父亲以卖劈柴和柴墩为生 儿子以卖根雕原料为生
孙子以卖黄沙为生
……
例文： Preserving Natural Resources
Through the changes in the ways of making a living in a family over several generations, the cartoon aims at sounding a warning against man's wasteful use of natural resources and emphasizing the urgent need to preserve these resources.
Ever since man appeared on the earth, man's survival has been heavily relied on nature. Almost everything we use in our everyday life comes from nature, ranging from the food we eat, the water we drink, to the wood which is turned into furiture. With the development of technology and population growth, the amount and range of materials used has increased at an alarming rate. However, natural resources are not inexhaustible. Some reserves are already on the brink of exhaustion and there is no hope of replacing them. The widespread water shortage is an example in point. If man continued to squander natural resources with no thought for the future, the later generations would end up selling sand, as is the case in the cartoon, and the whole world would be in a mess.
Time is running out. It is up to us to take effective measures before the situation gets out of hand.
京京魅力
我找了些四级作文模板一. 对比选择型热点追踪 Study Abroad or in China?There is no consensus of opinions among people as to whether students should study abroad or not. Some people are of the view that the youths should go overseas for further study if possible, while others take an opposite stand, firmly believing that it is of no necessity for students to study in a foreign country.Those people who maintain that it is good for students to go abroad for further study believe that diverse culture background can broaden students’ horizon. They also claim that overseas study can shape students’ personality because they are forced to deal with all kinds of difficulties by themselves.Nevertheless, the other people who contend that domestic education is good enough for students argue that our educational quality has been greatly improved during the past decade. They also point out that domestic education is convenient and economical.As far as I am concerned, the former opinion holds more weight. For one thing, it can strengthen the learners’ abilities to understand and communicate with people from other cultures. For another, the developed countries still have a lot advanced knowledge which is worth our study. When all the factors are examined, we may reasonably come to the conclusion that studying abroad if possible is advisable.二. 问题解决型实例：2001年1月（How to Succeed in a Job Interview? 面试在求职过程中的作用、面试成功的因素：仪表、举止谈吐、能力、专业知识、自信、实事求是……），2000年1月（How I Finance My College Education?）1998年1月（My View on Fake Commodities）模板：With the development/improvement of (铺垫), (某一问题). It is necessary that (关注解决现象引出的问题很必要). On the one hand, (理由一). On the other hand, (理由二).Therefore, how to (承上启下句，要解决的问题) is worth paying attention. Firstly, (办法一). Secondly, (办法二). For example, (举例解释解决办法二). Thirdly, (办法三). In other words, (阐明解决办法三).In fact, the ways to (解决问题的办法多种多样) are countless. It’s time that (强调解决问题时不可待).真题演练： How to Succeed in a Job Interview?（2001年1月） With the development of job market, job interview plays an important role in job-hunting. It is necessary that we should learn some tricks to perform better in a job interview. On the one hand, a job interview offers interviewees and interviewers respectively a chance to know each other within a very short time. On the other hand, excellent performance in an interview will enable the interviewees to exert a good impression on the interviewer and finally win the job.Therefore, how to succeed in job interview is worth paying attention. Firstly, interviewees should dress neatly and properly. Secondly, interviewees should be confident. For example, when asked about professional questions, interviewees should give a clear and definite answer. Thirdly, interviewees should have some knowledge about the company and the position they apply for. In other words, interviewees should prepare themselves something about the interview in advance so as to show that they attach vital importance to the job.In fact, the ways to succeed in a job interview are countless. It’s time that we laid stress on interview because it’s the first step of our work experience. 热点追踪The Damage of Public Facilities1、公共设施破坏严重的问题亟待解决，2、解决办法有哪些，3、你的看法。 The Damage of Public FacilitiesWith the improvement of living standard, more and more public facilities, such as public telephone booths and ATMs have been installed in the streets. It is necessary that we have to pay attention to the damage of these public facilities. On the one hand, some people use them without care, which leads to inconvenience to others. On the other hand, the damaged public facilities stain the beauty of the city.Therefore, how to prevent public facilities from being damaged is worth paying attention. Firstly, public facilities should be made of hard materials so as to be more durable. Secondly, some devices should be adopted to protect them from being damaged. For example, like cars, we can install alarm devices in public facilities. Thirdly, from my point of view, it is essential that we civilize our citizens to behave morally. In other words, we should tell the citizens that it is shameful to destroy public facilities.In fact, the ways to reduce the damage of public facilities are countless. It’s time that we took most effective ones to protect them.三. 观点论证型实例：2003年1月（It pays to be honest）、1999年1月（Don’t hesitate to say “No”）、1997年1月（Practice Makes Perfect）模板：It is true that (指出普遍存在的观点). However, (谈不同的观点). I think (提出自己的观点，即文章的论点). (过渡句，转向观点的论证，根据情况选择具体的词) can be listed as follows. Firstly, (论证理由一). Secondly, (论证理由二). For example, (举例具体说明理由二). Thirdly, (论证理由三). A case in point is that (举例具体说明理由三).It goes without saying that (转折句，提出执行该观点时应注意的事项). There is no doubt that (得出结论). In conclusion (总结全文).真题演练： It Pays to be Honest（2003年1月） It is true that most of us value honesty highly. However, nowadays we often confront confidence crisis such as cheating, overcharging, fake commodities and so on. I think that we should be honest because being honest is not only beneficial to ourselves but also to others and the whole society. The reasons can be listed as follows.Firstly, only honest people can be truly respected by the others and can make more friends over a long period of time. Secondly, honesty, which is the traditional virtue of the Chinese people, can make our life easier and more harmonious. For example, consumers will not be afraid of being overcharged if dealers are honest, and thus dealers can win over more customers. Thirdly, honesty can make our society more stable. A case in point is that Singapore, a society featuring trustworthiness and integrity, has a comparatively low criminal rate.It goes without saying that being honest is of great benefit to both the community and individuals. There is no doubt that we should foster the spirit of honesty. In conclusion, laying stress on honesty will become the public morals in our society.四. 图表说明型 实例：2002年6月，1991年6月模板:(概括性词语最近出现的总体现象) has become a common part of people’s life. And (题目要求讨论的具体现象) has always aroused the greatest concern. What impresses us most is (现象的具体表现). The reasons （现象或现象带来的结果，为下文分析产生的原因做铺垫）are varied.Among the various reasons, (原因一) plays an important part. That is to say, (具体说明原因一). What is more, (原因二). For example, (举例说明原因二).When talking about (作者要讨论的现象), (作者的看法). On the one hand, (支持看法的理由一或说明看法的第一个方面). On the other hand, (支持看法的理由二或说明看法的第二个方面). In brief, (总结).真题演练： Student use of computers （2002年6月） Using computers has become a common part of people’s life. And the tremendous growth of student use of computers has always aroused the greatest concern. What impresses us most is that, in 2000, college students averagely spent 20 hours per week on computer, which is the size more than ten times that of ten years ago. The reasons why computers are widely used are varied.Among the various reasons the decreasing price of PC plays an important part. That is to say, more students can afford a personal computer. What is more, the Internet provides college students an amazing world to explore, For example, people can get the latest news and information as well as conveniently make friends around the world.When talking about disadvantages and problems existing in student use of computers, I think that their lack of skills and disciplines is the point we should pay attention to, On the one hand, their lack of skills fails students to make full use of the computer and the Internet. On the other hand, their lack of necessary disciplines makes some students indulge in computer games and net world, and even other negative materials, forgetting their major tasks as college students. In brief, there is still a lot to do to help students make good use of computers.热点追踪：Cheating in Exams1、学生作弊现象越来越严重，2、作弊的原因，3、如何杜绝作弊。 Cheating in ExamsTrying to defeat the cheat has become a common part of people’s life. And cheating in exams on campus has always aroused the greatest concern. And cheating in exams on campus has always aroused the greatest concern. What amazes us most is that many methods are adopted by students. The reasons for cheating in exams are varied.Among the various reasons, to get higher scores or scholarships plays an important part. That’s to say, some students are under great pressure from their parents or they fear to fall behind others, so they to get high scores in exams. What is more, some students just play the time away and want to pass the exams without efforts. For example, they spend the whole night playing PC games but fall asleep in the class. When talking about how to deal with cheating in exams, I think education and punishment might work. On the one hand, we should explain the harm of cheating to the students. On the other hand, punishment or penalty should be given to those who have been found cheating. In brief, we should try our best to put an end to cheating.五. 应用文A：批评、抱怨、投诉信：Dear ,My name is (姓名). I am (身份). I venture to write you a letter about (表述抱怨内容).The focus of the complaint is (抱怨内容的核心点). For one thing, (抱怨内容的一个方面). For another, (另一方面). Honestly speaking, (客观评论). But (抱怨产生的原因之一). Besides, (抱怨产生的原因之二).All in all, there is still much room for improvement (总结说明所抱怨现象或事物还有很大改进空间). I do hope (表达本人的愿望). Thank you for your time and kind consideration. (信件结尾常用语) Sincerely Yours, Signature真题演练：2002年1月假如你是李明，请你就本校食堂的状况给校长写一封信，内容应涉及食堂的饭菜质量、价格、环境、服务等，可以是表扬，可以是批评建议，也可以兼而有之。 A Letter to the Editor of a NewspaperDear Editor,My name is Li Ming. I am a senior junior student of the civil engineering school in this university. I venture to write you a letter about the canteen service on campus, which has given rise to many complaints among students..The focus of the complaint is the poor quality of the food. For one thing, the rice is hard, the steamed breads are usually sold cold and vegetables are often overcooked. For another, the prices of the foods are surprisingly high.. Honestly speaking, the dining environment has been improved since last year. But there are still enough space and seats for us to have our meals there. Besides, the attitude of the canteen staff is not hospitable at al.All in all, there is still much room for improvement. I do hope we will not suffer another year. Thank you for your time and kind consideration.Sincerely yours, Li Ming B：建议信模板Dear ,I am delighted to learn that (写信的原因). It (引出作者的建议). In my opinion, (表达建议内容). On the one hand, (提出建议的理由一). On the other hand, ( 建议的理由二).As to the (具体到某一方面的建议内容), I suggest (). If (供被建议人选择的条件). It is unnecessary for you to (建议内容的另一方面). In addition, (其它的建议). I am sure (对建议内容的评价).Please inform me (对建议内容所做的承诺). I am looking forward to (表达本人的愿望).Sincerely Yours,Signature真题演练：Directions: For this part, you are allowed thirty minutes to write a letter. Suppose you are Zhang Ying. Write a letter to Xiao Wang, a schoolmate of yours who is going to visit you during the weeklong holiday. You should write at least 120 words according to the outline given below in Chinese:1、表示欢迎，2、提出对度假安排的建议，3、提醒应该注意的事项。 A letter to a schoolmate Dear Wang,I am delighted to learn that you will visit me for a week during this national holiday. It has been a pleasant surprise to hear from you again after such a long time. In my opinion, Shenyang is your best choice for this vacation. On the one hand, there are many places of interest and historical sites in Shenyang. On the other hand, Shenyang is cultural center with various artistic and musical performances..As to the famous sites, I suggest that you should visit Shenyang Imperial Palace Museum. If you are interested in gardens, Shenyang Botanic Garden won’t disappoint you. It is unnecessary for you to bring anything except your sweaters since it is a little cold in the evenings. In addition, as there will be many people at the railway station, you should not leave your belongings unattended. I am sure you will have a nice time here.Please inform me when you have come to a decision. I am looking forward to seeing you soon四级作文模板模板1．对比选择型---两种观点/现象对比 *参考题例：真题 [03.1] It Pays to Be Honest [99.6] Reading Selectively or Extensively? [00.6] Is A Test of Spoken English Necessary? [96.1] The Two-day Weekend 第一段：Some people tend to think that…(观点一) They point out that…(理由一) Additionally，…(理由二) A case in point is…(举例) Therefore…(小结) 第二段：On the contrary/However/In contrast/On the other hand，other people hold the view that…(观点二) They argue that…(理由一) What's more… (理由二) As an illustration，…(举例) Accordingly，…(小结) 第三段：As far as I am concerned，(I think) ….(我的观点) The reason is that…(理由一) And also，…(理由二) So，… (总结自己的观点) *其他题例：1）Should Education Be Commercialized？ 2）Chosen A Famous University or A Favorite Major？ 模板2．说明利弊型---某一观点/现象有利有弊,行成自己的新观点. *参考题例：真题[98.6] Do “Lucky Numbers” Really Bring Good Luck? 第一段：Whenever we hear people say that…(主题) , we'll instantly have the idea that it is a good／bad thing for．．．(某人). Indeed，…(主题)have advantages to…(某人). We can take…(举例)as an example…．It will benefit…(好处一)In addition…(好处二) 第二段：In the mean time,we must realize those disadvantages of…(主题). First of all，..(坏处一)Second,…(坏处二) 第三段：To sum up the above arguments，I think a proper attitude towards…(主题)is that…(我的观点) *其他题例：1）College Life in Internet Era 2）Stress in Modern Life … … 模板3．问题解决型-----对某一问题进行分析,找出解决办法,表达自己的看法. *参考题例：真题[00.1] How I Finance My College Education? [01.1] How to Succeed in A Job Interview? 第一段：Nowadays，we have to face a problem that…(问题)／Nowadays，more and more people are concerned about the problem…(问题)／It is important for us to…(问题)For instance…(例一)／First，…(原因一). Moreover，…(例二)／Second，….(原因二) 第二段：People have figured out many ways to solve the problem．／Confronted with…(问题)we should take a series of effective measures to cope with the situation．Firstly，…(解决方法一)Secondly，…(解决方法二) 第三段：Personally，I believe that…(我的方法)／To me，I am taking two ways to solve the problem of…(问题)One of them is…(我的方法)The other way is…(方法二)By now ways have been working perfectly and efficient1y…(结果) 模板4．阐述主题型----对某一命题或概念进行阐述 *参考题例：真题[98.1] Harmfulness of Fake Commodities 第一段: A famous saying goes that…(名言或谚语). It means that…(释义). An example of this case is…(举例，解释). 第二段：Another case in point is…(例二) 第三段：I like the saying．．．(名言) which encourages me．．．(理由) 模板5．图表题 [graph, chart, table, flowchart, picture, map ] *参考题例：真题[02.6] The Student Use of Computers 第一段: From the graph，we know the statistics of．．．(图表概况)It can easily be seen that．．．(揭示含义) 第二段：There are many reasons responsible for this instance，and the following are the typical ones．For one thing，…(理由一)in addition，．．．(理由二)The main reason is that．．．(理由三) 第三段：However，this graph may not predict the entire situation in the future．I believe．．．(前景预测)／Above all，we now know about the problem and we should try to find some ways to solve it . For one thing，．．．(方法一)For another thing，．．．(方法二)Still another，．．．(方法大学四级作文模板1. 对立观点型(1) … has become a hot topic among people recently. Opinions vary from person to person. Some people are inclined to think that … On the contrary, there are still many people who won’t agree, and they claim…Those who criticize… argue that… However, people who advocate … on the other hand, maintain that…As far as I am concerned, my favor goes to the first/second view. Admittedly, …but it doesn’t follow that… Only if … can we…, just as the saying goes…(2) When being asked about… different people will offer different answers. It is held by some people that…However, it is also believed by other people that…Those who hold the first opinion think that…In contrast, those who hold the second view think that…In my opinion, both sides are partly right. When we… we should take into consideration all aspects of the problems and then make the right decision.(3) As we all know, the general public has been debating whether… is a blessing or a curse. Scientists have made advances in… where… Some people support … , saying … Other people oppose…, saying…Those in favor of this research believe that…Those opposed to this 无效 of research argue that…Apart from the benefits mentioned above, we should also face several unavoidable challenges. In the first place, … In the second place… Only when… can we…(4) Nowadays more and more people voice growing concern over…. Some people argue that … in that…, while others firmly hold that….As far as I am concerned, this question should be probed in depth. On the one hand, the first group is not totally correct because not all…. On the other hand, the second opinion seems not so satisfactory because we also witness successful examples….From that has been discussed above, we can see clearly that the key lies in whether…, Otherwise, … no matter whether….2. 说明利弊型(1) Nowadays, … is playing a more and more significant role in people’s daily life. However, people’s opinions are still divided on this point.Those who are in favor of … claim that it has a lot of advantages. For one thing… For another… Those who are opposed to … hold that disadvantages are many. On the one hand, … On the other hand…By and large, the advantages derived from… far outweigh the disadvantages … entails.(2) Few things can be compared with… in terms of …On the one hand, … On the other hand…However, just like anything else, there are also disadvantages for…For one thing… For another…All in all, we could safely come to the conclusion that the pros outweigh the cons. The past twenty years witnessed the fast development of … along with …. A brighter future is awaiting us if we make good use of …(3) There is a good side and a bad side to everything, and … are no exception. Generally speaking, the positive aspects could be listed as follows. For one thing, … For another…However, as every coin has two sides, the negative aspects are also obvious. On the one hand, … On the other hand…Up until now, we could see it clearly that …. The key lies in the user-so long as we could make proper use of it. It can be most helpful to us in many respects.(4) The discussion about … has never stopped in the past few years. Let’s have a look at its advantages and disadvantages before drawing the final conclusion.The biggest advantage of… What’s mor
stonegossard
排放冷却是对流冷却的另一种。与再生冷却不同，用于排放冷却的冷却剂对推力室冷却吸热后不进入燃烧室参与燃烧，而是排放出去。直接排放冷却剂会降低推力室比冲，因此需要尽可能减少用于排放冷却的冷却剂流量，同时只在受热相对不严重的喷管出口段采用排放冷却。还有一种是辐射冷却，其热流由燃烧产物传给推力室，再由推力室室壁想周围空间辐射散热。辐射冷却的特点是简单、结构质量小。主要应用于大喷管的延伸段和采用耐高温材料的小推力发动机推力室。在组织推力室内冷却时，是通过在推力室内壁表面建立温度相对较低的液体或气体保护层，以减少传给推力室室壁的热流，降低壁面温度，实现冷却。内冷却主要分为头部组织的内冷却（屏蔽冷却）、膜冷却和发汗冷却三种方法。推力室采用内冷却措施后，由于需要降低保护层的温度，所以燃烧室壁面附近的混合比不同于中心区域的最佳混合比（多数情况下采用富燃料的近壁层），造成混合比沿燃烧室横截面分布不均匀，使燃烧效率有一定程度的降低。膜冷却与屏蔽冷却类似，是通过在内壁面附近建立均匀、稳定的冷却液膜或气膜保护层，对推力室内壁进行冷却，只是用于建立保护层的冷却剂不是喷注器喷入的，而是通过专门的冷却带供入。冷却带一般布置在燃烧室或喷管收敛段的一个横截面上。沿燃烧室长度方向上可以有若干条冷却带。为提高膜的稳定性，冷却剂常常经各冷却带上的缝隙或小孔流入采用发汗冷却时，推力室内壁或部分内壁由多孔材料制成，其孔径为数十微米。多孔材料通常用金属粉末烧结而成，或用金属网压制而成。此情况下，尽可能使材料中的微孔分布均匀，是单位面积上的孔数增多。液体冷却剂渗入内壁，建立起保护膜，使传给壁的热流密度下降。当用于发汗冷却的液体冷却剂流量高于某一临界值，在推力室内壁附近形成的是液膜。当冷却剂流量低于临界值流量时，内壁温度会高于当前压力下的冷却剂沸点，部分或全部冷却剂蒸发，形成气膜。除了以上热防护外，还有其他热防护方法如：烧蚀冷却、隔热冷却、热熔式冷却以及室壁的复合防护等。3 高焓气体发生器热防护方案综合上述方法结合实际情况，便得到高焓气体发生器的热防护方法。高焓气体发生器的燃烧室与液体火箭发动机的不同，省去前面的推力室部分，使得其结构更简单而有效。那么，所涉及到的热防护即为对燃烧室室壁的热防护部分。由于燃料进入燃烧室内迅速分解并放出大量
Vickey小姐
1.讨论观点类文章：
Nowadays,there is a growing concern over such a phenomenon that_ .
如今，人们越来越关注这种现象——(这是第一步，提出观点。)
Different people have different views on_____.Some people think that_____, others argue that __________.
不同的人有不同的观点，一些人觉得——，其他人觉得——(继续观点。)
A情境是教师人为 创设的典型场景，deenlamp.com是在教学和教育过程中创设的有情之境，是一种人为优化的典型环境。s far as I am concerned, I agree with the opinion that ___________.For one thing,I firmly believe that ___________.For another,_____________.Just think of________.
就我而言，我同意这样的观点——。首先，我坚信——。另外，——。想想——。(论证观点。)
Taking all these factors into consideration(Form what has been discussed above),we may safely come to the conclusion that______.Only if_______can we _______,just as the saying goes,________________.
把所有这些因素考虑进去(形成上面已经考虑过的)，我们可以有把握地得出这样的结论——。除非——我们可以——，正如俗话说的，——。(以此结束论点。)
2.提出问题类作文：
It is quite natural for ________to ponder over the question of whether to _______________.
Many _________will choose not to______________,generally for three reasons.On the one hand,___________.On the other hand,______________.Most importantly,__________.Nevertheless, oher people adopt a completely different view,thinking that_____________.
Moreover,(此外) they further argue that___________.
From what we have discussed above,we can draw the conclusion that the question quite depends on personal choice.In my own eyes,________.
3.解决办法类作文
If the Chinese people even want to improve their life quality, the problem of __________ has to be solved. With more and more people _______, this problem is becoming more and more serious in terms of scale and scope.
First of all,_________. What’s more,__________. Only when all the people stop pursuing personal interests at the price of ________ can we hope to put an end to this unfavorable situation.
The _________ is of great importance to every member of our society. As long as the government, society and individuals make joint efforts, a sound solution is not far away.
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