画一个箭头，每一行转换参数，根据关键点。

Draw an arrow, each line transformed according to keypoint parameters.

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我们可以在这里画一个箭头来指明该走哪条路。

We can paint an arrow here to indicate the right way.

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轻松地画一条有箭头或没箭头的线把一个想法和另一个关联起来。

Simply draw a line with or without an arrow linking one thought to another.

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The proper way to draw a vector is to draw an arrow that's got a beginning and it's got an end.

画矢量的正确方法是,画一个有起点和终点的箭头

耶鲁公开课 - 基础物理课程节选

Then, you make an arrow corresponding to B and lay it on the end of this one.

再画一个表示 B 的箭头,把 B 放在 A 的终点

耶鲁公开课 - 基础物理课程节选

Now, you realize that... By the way, when you draw a vector like A, you're supposed to put a little arrow on top.

现在,大家应该发现...,顺便提一下,当你画了一个矢量,比如 A 时,上面要加个小箭头

耶鲁公开课 - 基础物理课程节选