"下定义"，【个人感觉其实下定义是论证方法的一种】可以给读者一个直观的概念或者清晰的思路，并且有利于后文的发展，而它本身并非只是字典上的解释，可以灵活使用。接下来，将介绍一些它在大作文不同阶段里的应用：
 

（一）引言段中的应用

1. Globalization
Globalization-the international spread of products, ideas and information-is bringing the world closer together. But globalization is not a new concept. For thousands of years，nations have roamed the earth in search of new markets and new sources of raw materials for their own industries.
关于"全球化"这个名词，考生并不陌生，但是如何用合理的语言来赋予它一个含义，这并非易事，上述的引言段就很好地做到了这一点，先是从字面上诠释了"全球化"的定义，进而又从实际生活角度赋予了它另外一层含义。
2. Telephone/Mobile phone
Imagine using smoking signals，carrier pigeons or riders on horseback to send an important message. Although those methods may sound strange，years ago people used them to communicate. Today，all a person has to do is pick up a telephone/mobile phone.【文章有新意，用对比的方法引出手机的定义，对比中又幽默含蓄的批判。我喜欢】
对于电话这一现代通讯工具，地球人都知道它是干嘛的，不过呢，我们可以从对于电话功能的定义上做文章，同样也可以赋予它一个生动的含义，并且一下子可以吸引读者眼球。
3. Studying abroad
Every year，students around the world leave behind the comforts of home to pursue a study-abroad experience in a foreign country. While many would say that studying abroad is advantageous，some would argue otherwise.【简简单单，切中肯綮，有的时候，平平淡淡才是真】
出国留学同样是一个非常熟悉的话题，若直接用字典上的定义直接去解释它显然多此一举，因此，我们不妨从侧面突破，通过引入大量学生出国留学的事实和目的来诠释这个再也不能熟悉的话题，同样可以起到很不错的效果。
4. Success
As Thomas Edison once said，"If you wish to succeed，you should use persistence as your good friend， experience as your reference，prudence as your brother and hope as your sentry. "This essay is going to look at factors that constitute success.【在文章开头写名人名言，要三思而行，开头写名言的同学直接被"枪毙"的比比皆是】
"如果你希望成功，当以恒心为良友、以经验为参谋、以谨慎为兄弟、以希望为哨兵。"这是伟大的美国发明家爱迪生曾经说过的一句话，借助名人名言来下定义又是一种非常有效的开头方式，这样做一方面揭示了文章接下来的主题，另一方面也增强了说服力，可谓是一举两得。
 

（二）主体段中的应用

1. Some people think that universities should provide graduates with the knowledge and skills needed in the workplace. Others think that the true function of a university should be to give access to knowledge for its own sake，regardless of whether the course is useful to an employer. What，in your opinion，should be the main function of a university? (剑七Test 4)
以下是此题目一篇范文的第2个主体段：
However, reaching the conclusion that other functions，such as giving access to knowledge for its own sake，are no longer important is biased. For hundreds of years，especially in the west，the undergraduate education is，indeed， a liberal education，which means the undergraduates learn a wide range of curriculums such as psychology， economics， politics that has no direct relations to jobs. The upsides of this is that it firstly enables students to become broad-minded and help them lay a solid theoretical foundation，then they will be able to choose the most appropriate field based on their own interests for further studies.