If you drop the arrow, it's the usual convention, if you're talking about the length of the vector A.

如果你把箭头去掉,就表示矢量 A 的模长,这是约定俗成的

耶鲁公开课 - 基础物理课程节选

If you think of the idea, you think of the basic logic, and then you go ahead and drag and drop accordingly.

如果你有这个想法，然后你考虑下基本的逻辑，你就能做相应的拖动或下降。

哈佛公开课 - 计算机科学课程节选

I would be grateful if you would wait until that point if at all you possibly can. It just makes the whole thing work a little easier and it prevents that drop in the pit of my stomach when I see half of the class leave.

我将感激不尽,这样会好一点,以免我看到半数人走掉时,心情会受到影响。

耶鲁公开课 - 1945年后的美国小说课程节选

If the stereotype is "your group doesn't do good in this," if I remind you that you're a member of that group immediately before doing it, your performance will drop.

如果刻板印象是“你的群体数学不好”,如果我在考前说，你是这个群体的,你的表现就会下降。

耶鲁公开课 - 心理学导论课程节选

So if you've ever done something bad like drop your laptop or smack your computer and you've never been told not to do this.

如果你以前做过类似的摔或拍打电脑,并且没有人告诉你不可以这样做。

哈佛公开课 - 计算机科学课程节选