outline [ˈaʊtlaɪn]

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n.大纲，轮廓，概要，要点；v.描画轮廓，描述要点

the main shape or edge of something, without any details

Make an outline before trying to write a composition. 写作文之前先写个提纲。
Draw an outline before you fill in the details. 先画个轮廓，再画细部。