It's a way of breaking the code up into modules. Modules that makes sense on their own. Modules that we can reuse in multiple places. Modules that, if you like, Isolate components of the process.

能将代码分解为模块,模块能够独自运作,我们能在很多地方再利用这些模块,如果你喜欢的话，模块可以被看作是过程独立的组成部分。

麻省理工公开课 - 计算机科学及编程导论课程节选

Now I have the ability to create a loop, that is, to reuse the same pieces of code over and over again as I go around.

现在我们已经学会如何创建循环了，也就是，重复的一遍又一遍的,执行同一片代码。

麻省理工公开课 - 计算机科学及编程导论课程节选