雅思写作指导：下定义在议论文中的用途

雅思写作指导：下定义在议论文中的用途,标签：雅思写作模板与范文,雅思写作题目预测与雅思写作机经,http://www.xuehuiba.com

　　Academic subjects，such as reading and writing，play a vital role in the education system. Apart from activating creativity and imagination，it helps students lay a solid foundation of knowledge. Some might say that academic subject is to a student as a rifle is to a soldier，without which he is unable to fulfill his mission……

　　在这个主体段中，作者在开头便举出了一些学术课程的具体内容，从而给读者一个概念，同时也展现了作者对题目的解读能力。接下来我们再来看一个相似的用法：

　　4.     Why have not alternative energies already replaced fossil fuels?

　　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。

　　综上所述，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，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。

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