We can start having complex expressions, you can imagine we can have things are lots of parens, and all sorts of things in it. Yes, question.

我们可以开始写复杂点的表达式了，你可以想象,我们有一个很多括号的表达式，里面有各种各样的东西，什么问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

All right, so I want to have some way of gluing those things together.

好你知道一个点的定义是什么,它有个x坐标有个y坐标。

麻省理工公开课 - 计算机科学及编程导论课程节选