She says the work is a poem about the people who cross our paths in a lifetime.

VOA: special.2010.07.12

All right, so let's go again what our paths are.

现在来在图上看看这两条路径。

麻省理工公开课 - 热力学与动力学课程节选

Now, if we go back to our Carnot cycle which is a set of reversible paths, it's useful to compare this to what happens in an irreversible case.

如果回到卡诺循环,它是由一系列可逆过程组成，我们将它,和不可逆过程的情况相比较。

麻省理工公开课 - 热力学与动力学课程节选