There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.

我们复习一下大一,学过的功的概念：,物体在力的作用下，运动了一段距离。

麻省理工公开课 - 热力学与动力学课程节选

I've put on the board up here the following and we're going to review this.

我在白板上写了一下这些,我们来复习一下

耶鲁公开课 - 聆听音乐课程节选

It's simply material found on page fifteen of your textbook but let's review it. We say this is a beginning course so we assume no previous knowledge.

这是你们教材十五页上的一些简单材料,我们复习一下,我们说这是个入门课程,所以假设之前你们没有任何相关知识

耶鲁公开课 - 聆听音乐课程节选

Okay? So let's review-- let's focus on that just for a moment.

好吗,让我们复习一下,让我们着重说一下这点,就一会儿

耶鲁公开课 - 聆听音乐课程节选