她轻轻擦了几下眼睛，擤了擤鼻涕。

She dabbed her eyes and blew her nose.

《牛津词典》

我转过身又向海里游了几下。

I turned and swam a few strokes further out to sea.

《柯林斯英汉双解大词典》

她轻轻地在他头上拍了几下。

She cuffed him lightly around his head.

《牛津词典》

Let's think about it for ten seconds why this could be interesting and relevant, and I want to ask if anybody changed their mind.

首先我们来,考虑下这条，提示几秒钟。

麻省理工公开课 - 热力学与动力学课程节选

Realize that there's this wonderful mechanism in place that allows you to put your toe in the water for several weeks no less and then get a sense, and then decide whether or not this is something for you.

要知道这种好的评分体制哈佛也有,在这种机制下你可以先试听几周,熟悉这一机制，然后再决定这是否适合你。

哈佛公开课 - 计算机科学课程节选

And I want to spend a couple of minutes again reinforcing that. So if we look at that code and we were little more careful about this, what did we say to do? We said look an sorry.

内容了，我还要花几分钟,来强化下，所以,如果我们再仔细些看下代码，我们应该关注些什么？

麻省理工公开课 - 计算机科学及编程导论课程节选