There are a couple of copies of this on reserve in the music library and you can go over there inside of Sterling memorial Library and do the listening there if you want, but one way or another you've got to get a hold of this.

斯特林纪念图书馆里有一些拷贝件,你可以在心血来潮时,去图书馆里做音乐欣赏,总之你一定得去听

耶鲁公开课 - 聆听音乐课程节选

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