Where Aristotle made the courage of men in combat a central virtue of his ethics, Hobbes pointedly omits courage from his list of the moral virtues.

亚里士多德把战争中,勇敢的人作为最高美德，而霍布斯恰恰是把勇敢,从美德的列表里删掉了。

耶鲁公开课 - 政治哲学导论课程节选

I'm using it as an abstraction, saying I'm going to have square root from somewhere, maybe I'll build it myself, maybe somebody gives it to me a s part of a library, so I'm burying the details inside of it.

我把这个方法作为一个抽象来引用，意味着我将会从另外一个,地方去求一个数的平方根，可能我会自己写这个方法,也可能我会从别人写的lib中去引用,因此我将实现的细节放到了其他地方。

麻省理工公开课 - 计算机科学及编程导论课程节选