You're taking the air inside of the pump and you're compressing it. You're doing it so fast that there's not enough time for heat to come out of the gas that's inside the pump towards the walls of the pump.

你把空气吸进气筒里并且压缩它,你的动作很快以至于,没有足够的时间让热量,从气筒里面跑出来,传递到气筒壁上。

麻省理工公开课 - 热力学与动力学课程节选

Your compressing it really fast, all right, so you're changing the pressure.

你把它压缩的非常快，好的，那么你改变了压力。

麻省理工公开课 - 热力学与动力学课程节选