And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

当粒子或其他东西,通过辐射或粒子的方式，并且能量高于临界值,撞击到硫化锌的表面上的时候，就会发光。

麻省理工公开课 - 固态化学导论课程节选

As we increase the voltage, we get to a critical value at which it is possible to actually draw electrons across the gap.

当我们增加气压时，我们得到了一个临界值，在这个临界值上,将电子吸引过来是完全有可能的。

麻省理工公开课 - 固态化学导论课程节选

So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是,光从金属表面逐出一个电子,所需的最小频率。

麻省理工公开课 - 化学原理课程节选

How far should freedom of speech and that is to say speech that borders on, even verges into, civic impiety, ? how far should such speech be tolerated?

言论自由的界限,确切的说是临界言论，甚至是跨界谈到公民渎神的言论，这类言论的容忍界限为何？

耶鲁公开课 - 政治哲学导论课程节选

So, now we can talk about it in different terms, Ei for example, talking about e sub i, which is the incident energy or the energy of the light that comes in, or talking about work function here, and that's just another way to say threshold energy.

现在我们可以从不同的方面,来谈论它了，举例来说，它是入射能量或者进来的光的能量,或者谈论这里的功函数，它是另一种描述临界能量的方式。

麻省理工公开课 - 化学原理课程节选

Should it trump all other goods or does toleration reach a point when it ceases to be toleration and becomes in fact a kind of soft nihilism that can extend liberty to everything precisely because it takes nothing very seriously.

它胜过所有的好吗,或是容忍在达到一定的临界点时,就会崩解,而变成某种柔性虚无主义,且几乎援用到所有事物上,因为它对任何事都不是很认真。

耶鲁公开课 - 政治哲学导论课程节选