如果我改变压强如果压强升高，系统会说，不，我不想压强升高。

If I change the pressure, if I increase the pressure, the system is going to say, no, I don't want the pressure increased.

youdao

Because if it's irreversible, it's very likely that I don't know what the pressure inside the system is doing while this is happening.

因为对不可逆过程，系统内部的压强,没有明确的定义,气体不处于平衡态。

麻省理工公开课 - 热力学与动力学课程节选

I don't know what the pressure is doing in there, doing that expansion.

我不知道这个过程中,内部气体的压强。

麻省理工公开课 - 热力学与动力学课程节选

The pressure could not be, might not even be constant throughout the system.

很可能气体各处的压强,都不相同。

麻省理工公开课 - 热力学与动力学课程节选