And the reason I want to show you this is to notice that the recursion can be doubled.

如果我来写斐波那契数列你可以看看这儿,原因是我想让你看看这部分的递归可以翻倍。

麻省理工公开课 - 计算机科学及编程导论课程节选

And just to look ahead a little bit, you could easily imagine that I might want to not just put a statement in there, what the specs are, I might want to put some constraints. Some specific things to check for, to make sure that you're calling the code right.

这不仅是抽象的概念还有规范的概念，我们再往前看看,你可以简单的想象得到，我不仅仅是想在这里加一个声明,这些规范说明中我还想加一些约束，我们要注意一些特殊的事情。

麻省理工公开课 - 计算机科学及编程导论课程节选

I'll even tell you what it is ahead of time.

我甚至可以让你预先看看是哪些话。

耶鲁公开课 - 心理学导论课程节选