This is because my father rolls up his sleeves and prepares to work hard.

VOA: special.2010.05.02

This is a sign of my economic status: I don't have to work. It is middle and lower-class women who do not get to observe purdah in this way.

但这恰好是我经济地位的标志：,我不需要工作，只有中下阶层的女人,才像这样不遵守深闺的习俗。

普林斯顿公开课 - 人性课程节选

When I flail my arms around I generate work and heat. This is not a constant volume process.

这不是一个恒容过程,但如果我是一个系统，当我做这些的时候。

麻省理工公开课 - 热力学与动力学课程节选

Now,having said that,let me just say as an addendum -- and this is my opinion,you could ignore it-- that things work in France.

根据前面提到过的,再谈一点补充,这是我自己的看法,你们可以忽视,法国社会运行顺利

耶鲁公开课 - 1871年后的法国课程节选

So I differentiated this object, this is my first derivative and I set it equal to 0 Now in a second I'm going to work with that, but I want to make sure i'm going to find a maximum and not a minimum, so how do I make sure I'm finding a maximum and not a minimum?

这样我就对它求出导数了,这是一阶导数,令它等于0,一会我们就要计算了,但我先确定一下是最大值还是最小值,我怎么确定是最大值还是最小值呢

耶鲁公开课 - 博弈论课程节选