I knew it -- it was the odor which always comes before a thunderstorm.

VOA: special.2009.11.15

I don't expect you'll all immediately grab it, but you will need to understand it before the quiz comes along.

我不期望你们马上就能掌握，但是你们需要在,考试前弄懂它。

麻省理工公开课 - 计算机科学及编程导论课程节选

What about Locke's account of private property and how it can arise before government and before law comes on the scene?

大家如何看待洛克关于私有财产,及其如何能早于任何政府法律而产生，这一观点？

耶鲁公开课 - 公正课程节选

and your only job during this tasks is to press the button when that target comes on before it leaves the screen.

而你在这些任务中唯一要做的事,就是在目标出现未消失前按下按钮。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

It predicts that the best timing is when the conditioned stimulus, which is the signal, comes before the unconditioned stimulus, which is what you have to prepare for.

它预测，最佳的时机,莫过于作为信号的条件刺激，出现在需要你做准备的，非条件刺激之前。

耶鲁公开课 - 心理学导论课程节选

I think I might want to take it down before he comes.

但在他来之前我得把这篇文章撤掉

耶鲁公开课 - 金融市场课程节选

It is a right that attaches to individuals as human beings, even before government comes on the scene, even before parliaments and legislatures enact laws to define rights and to enforce them.

这种权利依附于个体而存在，甚至早于任何政府的建立，甚至早在任何议会和立法机关,制定法律定义权利并强制实施前，就已存在。

耶鲁公开课 - 公正课程节选