Let's go back to high school for a moment, just by way of background.

让我们回到高中，去寻找一些相关背景。

麻省理工公开课 - 固态化学导论课程节选

Because a lot of these ships go blub on the way back, or are taken by pirates and stuff like that, they say, "We want to insure this ship.

因为有很多船只在回程的时候会损坏,或是被海盗之类的匪徒抢劫,他们说,"我们想为这船提供保险

耶鲁公开课 - 欧洲文明课程节选

So how would we go about solving this problem if I told you not only was there a maximum weight, but there was a maximum volume. Well, we want to go back and attack it exactly the way we attacked it the first time, which was write some mathematical formulas.

有些时候两个都重要,所以如果我告诉你这里不仅有,最大重量还有最大容量，我们应该怎么解决这个问题呢？,好了，我们想回过来然后,和第一次一样看看这个问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

What we're really getting at is the idea of saying I want to have a way of grouping together information into units that make sense. So I can go back to one of those topics we had at the beginning, which is the idea of abstraction, that I can create one of those units as a simple entity, bury away the details and write really modular code.

组合成为有意义的单元,那么这就让我们回到,一开始讲的话题之一了,这就是抽象的概念,也就是我可以以一个简单的，实体的形式创建这样的一个单元，把具体实现隐藏然后写一些,真正模块化的代码,我们在以后的课程中。

麻省理工公开课 - 计算机科学及编程导论课程节选