7. 定義法

　　在科普文章的寫作中，定義法是必不可少的。通過下定義，可以使讀者對該事物有一個更直接的認識。

　　Automation refers to the introduction of electronic control and automation operation of productive machinery. It reduces the human factors, mental and physical, in production, and is designed to make possible the manufacture of more goods with fewer workers. The development of automation in American industry has been called the Second Industrial Revolution.

　　這一段文字使我們了解了 automation 和 Second Industrial Revolution 兩個概念，分別由 refers to 和 been called 引出。

　　常出現在定義法中的詞語有：refer to, mean, call等。