What psychologists don't really know is why the Lake Wobegon effect exists, and there are a couple of proposals.

但心理学家还不知道,为什么乌比冈效应会存在，目前有几个假设。

耶鲁公开课 - 心理学导论课程节选

But most of the free citizens of the Roman Empire, - of Rome, were poor people-- free, and even citizens, but they were poor people who weren't part of any rich household.

但是大多数罗马帝国的自由公民，都是穷人-,他们是自由的，甚至是公民，但都是穷人，不属于富裕家户。

耶鲁公开课 - 新约课程节选

This is all by means of review but the question you can now ask is, "Fine. That's why moral feelings might evolve, but what do we know as psychologists about the emergence in nature of moral feelings in individuals?

这些知识我们以前都学过,现在你们要问一个问题，“好了，道德情感是这样产生的，但我们心理学家知不知道,自然界中的个体的道德情感是如何出现的？

耶鲁公开课 - 心理学导论课程节选