And I can find the orientation of the arrow You have the option of either working with the two components of A or with the arrow.

我也可以求得矢量的方向,你可以选择使用,A 的两个分量或者矢量图来计算

耶鲁公开课 - 基础物理课程节选

So in a moment you're going to go ahead and hit the spacebar and then as things fall from the screen when they line up with the left arrow, hit the left arrow with a different arrow, hit that arrow and see how good a score you can get.

一会儿你走到前面，敲一下空格键,当屏幕上面的东西从左边往下掉的时候,你就敲一下键盘上的左键,是哪个方向，敲对应的方向键就可以了,我们来看看你能得多少分。

哈佛公开课 - 计算机科学课程节选

The typical vector is called V or A or B something with an arrow on it.

表示矢量时一般在,字母 V,A 或者 B,上面加个箭头

耶鲁公开课 - 基础物理课程节选

The picture is more compelling with an arrow at this point.

在这里这张图中的箭头是扣人心弦的。

哈佛公开课 - 计算机科学课程节选