outline

/ˈaʊˌtlaɪn/

the line that appears to bound an object

中文释义：轮廓；大纲；概要

The teacher asked us to write an outline before starting the essay.

老师要求我们在开始写文章之前先写一个大纲。

In the dim light, we could only see the outline of the building.

在昏暗的光线下，我们只能看到建筑物的轮廓。