"As you watch the film you get in your ear a description of 'He is now hitting somebody with a stick,' or whatever the case may be.

VOA: special.2010.03.01

And our job is to find out what is the mathematical description of this path, this line in p-V's case that connects these two point.

我们的任务,就是找出，描述这条曲线的方程。

麻省理工公开课 - 热力学与动力学课程节选