论述文(Expository writing)是学术英语中最常见的文体。论述文的目的是论述、解释、阐明某种概念或某件事情。论述文依靠较严谨的组织、多种写作技琵和多种表达手段来完成其本身的结构发展。为了阐明事物,常见的写作手段包括定义、描述和举例说明等等。本文仅就其中一项技能“定义”的最基本写作手段,常用的表达方法以及写作时应该注意 Expository writing is the most common style in academic English. The purpose of the exposition is to discuss, explain, and clarify a concept or something. Essays rely on a more rigorous organization, a variety of writing skills and a variety of means of expression to complete its own structural development. In order to clarify things, common writing methods include definitions, descriptions, and examples. This article only refers to one of the most basic writing methods for “defining” one skill, common expression methods, and writing notes.