And so, one constraint is the process be done reversibly.

一种约束,就是过程是可逆的。

麻省理工公开课 - 热力学与动力学课程节选

Now we are going to do the same thing with a different constraint.

我们来看看,另一种约束下的过程。

麻省理工公开课 - 热力学与动力学课程节选

We could have isolated.

另外一种约束是孤立系统。

麻省理工公开课 - 热力学与动力学课程节选