If the latter, if this hierarchy of intelligence or this hierarchy of the rational is the result of upbringing, ? then how can slavery be defended as natural?

若是后者，即智慧的阶级制度,或说理性的阶级制度,是教养的结果，那奴役如何能以自然演变加以辩护？

耶鲁公开课 - 政治哲学导论课程节选

And, in fact, the most dominant proponent of the view is our very own Frank Keil, master of Morse College at Yale, who has strongly defended the notion of an intuitive biological module.

事实上,这个观点最主要的支持者,是我们学校的弗兰克·凯尔,耶鲁莫尔斯学院的院长,他为直觉生物学模块做出了有力的辩护

耶鲁公开课 - 心理学导论课程节选

Now, how is slavery defended?

现在,奴隶制保卫战的本质是什么呢

耶鲁公开课 - 美国内战与重建课程节选