The trial of Socrates takes place in the year 399 and all of these refer to before the common era 399.

苏格拉底的审判,发生在公元前399年，这些,全都指向共同年代─399年之前。

耶鲁公开课 - 政治哲学导论课程节选

I said it before this is a commen sense and I want to illustrate the common sense nature of this in a few ways.

我之前说过,这是个普遍观点,现在我要从几个方面,来说明这个普遍观点

耶鲁公开课 - 心理学导论课程节选