De Broglie has said electrons, under certain circumstances, can be modeled as behaving as though they are waves.

德·布罗意说过电子，在某种特殊的情况下，也可以运转，即使它们都只是波。

麻省理工公开课 - 固态化学导论课程节选

So, you can imagine in certain circumstances there would be guys that old back there, but fundamentally it's between 20 and 45.

所以你能想象,在某些情况下,也会有老年人,但基本上是二十到四十五岁的

耶鲁公开课 - 古希腊历史简介课程节选

Now, I think in certain circumstances it becomes necessary to overlook that unjustness, perhaps condone that injustice as in the case of the cabin boy being killed for food.

我认为在某些情况下,我们需要忽视这种不公平，容忍这种不正义,例如在救生艇里被当作食物的男孩。

耶鲁公开课 - 公正课程节选

Suicide, under certain circumstances, might be rationally and morally justified.

自杀有时候，也有可能是合乎常理的。

耶鲁公开课 - 死亡课程节选

And I think there's that constant tussle going on in us Circumstances can push someone one way while another certain encouragement pushes more towards acting ethically.

在我们的内心时常会有这样的斗争,特定的环境促使我们选择漠视,同时，一些鼓励促使我们依照道德行事。

普林斯顿公开课 - 人性课程节选