"It took us a long time to get here. It is going to take some time for us to work through this.

VOA: standard.2009.04.05

And what we saw last time is that this was necessary to make things work, this part of it in particular.

上节课我们讲,这是对外做功的必要条件，特别是这个部分。

麻省理工公开课 - 热力学与动力学课程节选