What we think of as the golden age of Greece was virtually at an end during the lifetime of Aristotle.

我们所知的希腊黄金时期,在亚里士多德的生年,其实已走到末端。

耶鲁公开课 - 政治哲学导论课程节选

There are types of changes that are known.

有些种类的变化已为人所知

耶鲁公开课 - 生物医学工程探索课程节选