You've got to put more pressure on one side than the other if you want to push that gas through the throttle, right? So this is where the time scale issue comes into play.

如果你想让更多的气体通过节流阀,应该使一边的压强,大于另一边，是吗？所以这就是,时间尺度发挥作用的地方。

麻省理工公开课 - 热力学与动力学课程节选

Censorship only comes into play once a text has actually been in circulation for a while, only after a number of readers have found a published text to pose a threat.

控制仅仅是一本书已经出版发行一段时间,一些读者已经发现这印刷的文本,造成威胁时才起作用的。

耶鲁公开课 - 弥尔顿课程节选

Now let's see where diet comes into play here and how diet affects these different diseases.

现在我们来看看饮食和它们的关系,饮食又是如何影响这些不同疾病的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选