So Roman slavery and the freedom of that was actually one way that a few people in the Ancient World recognized some kind of social mobility, which was very rare in the Roman Empire.

所以罗马奴隶制以及奴隶释放制,被古代部分人认为是,某种社会阶级流动，在罗马帝国很少见。

耶鲁公开课 - 新约课程节选

Let's talk about more ancient societies and how food got started and what sort of phases we've gone through and how does that shape what's going on today.

让我们更深入地讨论古代社会及食品起源,还有我们经历了哪些阶段,这些阶段是如何影响我们现在的饮食

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But if we look at the society that emerges, this Dark Age society that emerges from the ancient world of Mycenae, what you have is a rare human experience.

如果我们仔细观察这渐渐浮出水面的社会,这个从古代迈锡尼文明浮现出来的,黑暗时代的社会,你会得到一些相当宝贵的经验

耶鲁公开课 - 古希腊历史简介课程节选