We want to create data types and functions, or we're going to call them methods, that are specifically aimed at manipulating those kinds of objects.

它们是特定的,用来操作那些对象的，我们的目标基本上来说，就是会去看看怎么去构建,能利用这种模块话。

麻省理工公开课 - 计算机科学及编程导论课程节选