And I would be able to simply bury away the details of how those other instances are created from how I want to use them by simply calling methods on the classes.

也就是一些线段的组合,我还可以把怎么实现那些,实例的细节包装起来,把它和调用实例分开来,我们下次还会接着讲这个。

麻省理工公开课 - 计算机科学及编程导论课程节选