This is a point that is often confusing, because you can think, well maybe I could calculate what the internal pressure is even for this very rapid process.

这一点可能让你们很困惑，因为你们可以想象这个过程，我也可以计算在这快速的变化中,内部压强是多大。

麻省理工公开课 - 热力学与动力学课程节选