Because it's so important. And I should add and also under reversible work, where the external pressure is equal to the internal pressure.

而且我还要说应该在外部压强,和内部压强相等的,可逆过程中引入它。

麻省理工公开课 - 热力学与动力学课程节选

where I can choose the hours I work and be able to attend my daughter's dance recitals

因为当上教授后，我可以选择工作的时间，这样就能参加女儿的独舞表演会了

为什么是会计学呢？ - SpeakingMax英语口语达人

In fact, I'll give an example in your own life where you will find that this law doesn't work.

其实,我可以举一个你们现实生活中的例子,它就不满足牛顿第一定律

耶鲁公开课 - 基础物理课程节选

So I now want to work through an example where we can see this happening.

现在我想跟大家一起做一个例子,来明白到底是怎么回事。

麻省理工公开课 - 计算机科学及编程导论课程节选

I hope you know what I mean; a brokerage service is a place where stockbrokers work and a stockbroker is somebody that manages your buying and selling of shares.

但愿你们听得懂,经纪服务业务就是股票经纪人从事的工作,股票经纪人,管理着股票的买入和卖出

耶鲁公开课 - 金融市场课程节选

These are the things that we do best and where we have advanced course work available in these three categories and so I'm going to emphasize these three but we'll talk about all of these subjects as we go through the course.

这是我们做的最好的三个方向,在这三个方向下我们开设有高阶的课程,因此我会重点讲这三个方向,但随着课程的进行,所有的主题我们都会讲到

耶鲁公开课 - 生物医学工程探索课程节选

I'm simply saying swap X with Y, but this 2 won't work, because where are X and Y defined?

我只简单地说交换X和Y，但是这两行不起作用，因为X和Y是在哪里定义的呢？

哈佛公开课 - 计算机科学课程节选