雅思写作一直是困扰考生的一个难点和瓶颈，不论是A类或是G类的同学，想要在写作中取得7分以上的高分是非常困难的事情。就考试本身而言，Task 2的得分起着关键的作用。“下定义”，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。

　　文章里，笔者并不是要探讨大作文的全盘攻略，而是围绕一种特殊的写作思路和切入点来诠释它在议论文中的运用，以期帮助大家提高大作文的得分。接下来，我们的老师将介绍一些它在大作文不同阶段里的应用：

　　一、主体部分的下定义：

　　实例一：Why have not alternative energies already replaced fossil fuels? 关于石油的话题 There are also problems with production stability. The amount of energy we need varies throughout the day，and conventional energy production，such as coal and oil，can be increased or decreased based on these variations. Alternatives like wind and solar power are limited because they can only produce electricity when it is sunny or the wind is blowing.在这篇分析型大作文里，作者通过对化石燃料和可替代燃料的对比，突出了前者的优点，也揭示了后者的不足。通过将一个名词范围中的具体例子举出，是下定义的另外一种诠释。

　　实例二：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)大学应该教会学生什么 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.这个段落的论述的中心是大学以传授知识本身为目的，作者使用了“通才教育”这个在西方国家非常流行的教育方式为佐证，在给出“通才教育”定义的本身，又用定语从句补充到了和题目第2个论点间的关系，从而进行了有力的对比，深化了段落中心。

　　实例三：Education教育When people leave school，they wish they could breathe a sign of relief and leave learning behind. However，learning should last a lifetime. You exercise your body to stay strong，and you should exercise your mind to stay sharp. ……在这个关于教育的话题中，作者在论述时用终身教育的好处来诠释教育的长期性和必要性，从而为下文的扩展作了很好的铺垫和过渡。

　　二、引言部分的下定义

　　实例四：Studying abroad 出国 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.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。

　　实例五：Success 成功 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.“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。下定义可用于议论文的开头或者主体段里，但是它一般不适用于用在结尾段中。除了字典上的定义外，我们建议考生还可以从这个名词或短语的功能、目的、包含的具体例子等方面赋予它含义，这些方式都属于下定义。

　　以上的五个实例都说明了具体的写作过程中如何用好下定义，你学会了吗?