OK, so now we're going to do the same kind of experiment, but irreversibly. An irreversible adiabatic.

现在来在,不可逆的条件下，完成相同的实验。

麻省理工公开课 - 热力学与动力学课程节选

And it's still adiabatic, but now it's constant volume. And it's also reversal right.

它仍然是绝热的，但现在是,在等体条件下，它也是可逆的。

麻省理工公开课 - 热力学与动力学课程节选

You can only do this because it's reversible. What else do I know?

这一步,只对可逆过程成立，还有什么已知条件？

麻省理工公开课 - 热力学与动力学课程节选