When we have both our feet firmly on the ground, and when we are down to earth we do not have our noses in the air.

VOA: special.2009.03.08

And what's fallen out when we do that, because in each case, one of the first derivatives gives us the entropy.

当我们这样做时就得到了结果，因为在这些例子中，一阶导数是熵。

麻省理工公开课 - 热力学与动力学课程节选

So we're going to go through a thermodynamic cycle, and here's what I want to calculate when we do this.

那么我们要推导,一个热力学循环,这是这个过程中我要计算的东西。

麻省理工公开课 - 热力学与动力学课程节选

And we -- and when we do so, though, we will always do so with the humility and understanding that we are not perfect and that we still have much progress to make.

WHITEHOUSE: President Obama Holds Town Hall with Chinese Youth

We evaluate where we have to go, what else we need to do and when we have to do it.

FORBES: Time trumps Money in Innovation

We will find out exactly what happened and, when we do, we'll come back and tell you.

BBC: burgers