You do it so quickly that the heat flow between the inside of the bicycle pump and the outside is too slow compared to the speed at which you compress.

我们用力很大,于是压缩得很快,打气筒内外热传递的速度,与之相比要慢得多。

麻省理工公开课 - 热力学与动力学课程节选

That example I gave last time with the bicycle pump was not quite the right example.

上次我举打气筒的例子,是不太恰当的。

麻省理工公开课 - 热力学与动力学课程节选

So you start with the bicycle pump at one bar, let's say, right?

一个大气压，开始？

麻省理工公开课 - 热力学与动力学课程节选

But you don't compress it so quickly that you're not in there reversible process so you compress that if you were to feel the temperature of the air and you can feel it through the nozzle gives you an idea of the temperature of the air inside your bicycle pump.

但是压缩速度,也不能太快,否则就不是,可逆过程了,这样当压缩气体时,从喷嘴可以感受到,内部气体的温度。

麻省理工公开课 - 热力学与动力学课程节选

But this time this really is the bicycle pump.

但在这里是很符合实际的。

麻省理工公开课 - 热力学与动力学课程节选

And that really is the bicycle pump.

这正是自行车打气筒的情况。

麻省理工公开课 - 热力学与动力学课程节选