1.sketch的基本意思是“绘制”,指用铅笔、蜡笔、粉笔等画线、画图等,强调“素描”“画草图”,引申可表示“概述”“简述”等。
2.sketch既可用作及物动词,也可用作不及物动词,用作及物动词时,接名词或代词作宾语。

sketch in(v.+adv.)
把…勾勒进去 plot in sth
▲sketch sth⇔in
He sketched in the details.他把细节勾勒了进去。
I don't quite understand; can you sketch in a few details of what you're suggesting?我还不太明白,你能否把你的建议说得具体一点呢?

sketch out(v.+adv.)
简述 speak or write briefly
▲sketch sth⇔out
Sketch out what you intend to do.简述一下你准备做的事情。
The teacher sketched out the main point of the article.老师扼要地叙述了文章的要点。

用作不及物动词
▲S+～(+A)
My sister often goes into the country to sketch.我姐姐常到乡间去写生。
She sketches purely as a hobby.她画素描纯粹是一种业余爱好。
用作及物动词
▲S+～+n./pron.
A sidewalk artist sketched the passers-by.街头画师给路人写生。
The historical article sketched the major events of the decade.这篇有关历史的文章概述了这十年中的重大事件。

sketch, plot
参见plot条。

［同义词］ n.  drawing, graph, outline, scene, summary
［词源］＜希腊语skhedio(梗概,草稿)

I will send you a slight sketch of the house.我将给你寄去房屋的草图。
He made a sketch of the tower.他给那座塔作了一幅素描。
He drew a sketch map of that town.他画了那个市镇的示意图。
Give me a sketch of your plan.跟我谈谈你的计划梗概。