只講重點的概要
把那條線借給內容：只勾出主要的形狀，細節先不填——所以一份 outline 給的是骨架，不是全文。
outline, summary · noun · B2
a short account of the main ideas or facts about something, without the small details.
概要；大綱
核心畫面
One way to picture outline: the line round the edge and nothing inside it — enough to show the shape, none of the filling. Trace a hill against the evening sky and you have the visual version; give the main points of a plan without the details and you have the same thing done with ideas.
可以想成 outline 是「只有外圍那條線，裡面留白」——形狀看得出來，細節一概沒有。傍晚天空襯出的山稜就是視覺版…更多收起
可以想成 outline 是「只有外圍那條線，裡面留白」——形狀看得出來，細節一概沒有。傍晚天空襯出的山稜就是視覺版的它；把一個計畫的重點講一遍、細節先不管，就是同一件事用想法做的。From the picture
Also in this word
outline, silhouette · noun · B1
A single line following the edge of something, showing its shape but nothing inside.
輪廓
outline, draw the shape · verb · B2
to draw a line around the edge of something, or to make the shape of something easy to see.
描出輪廓；顯出形狀
原始詞典資料11 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
outlinenoun/ˈaʊtlaɪn/
- 1
A line marking the boundary of an object figure.
- 2
The outer shape of an object or figure.
- From this point of vantage, we were able to gain an impression of the massive outlines of the main structure, and its intricate maze of girders.
- 3
A sketch or drawing in which objects are delineated in contours without shading.
- Painters, by their outlines, colours, lights, and shadows, represent the same in their pictures.
- 4
A general description of some subject.
- 5
A statement summarizing the important points of a text.
- 6
A preliminary plan for a project.
- the outline of a speech
- 7
broadcastingfilmmediaA prose telling of a story intended to be turned into a screenplay; generally longer and more detailed than a treatment.
- 8
fishinghobbieslifestyleA setline or trotline.
outlineverb/ˈaʊtlaɪn/
- 1
To draw an outline of; to describe.
- He stood transfixed before the unaccustomed view of London at night time, a vast panorama which reminded him […] of some wood engravings far off and magical, in a printshop in his childhood. They dated from the previous century and were coarsely printed on tinted paper, with tinsel outlining the design.
- 2
To summarize.
- Wikipedia items featuring books usually outline them after giving their background.
- At her invitation he outlined for her the succeeding chapters with terse military accuracy ; and what she liked best and best understood was avoidance of that false modesty which condescends, turning technicality into pabulum.
- 3
computingengineeringmathematicsTo optimize for size by replacing repeated code fragments with function calls.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。