蝴蝶和马利筋，犹如立足笔尖的铅笔，依靠共同进化的递归动态而立得笔直。

They are held together, poised upright like a pencil standing on its point, by the recursive dynamics of coevolution.

youdao

我们稍后会去，看它的变量，它的所谓的递归数的变量，但是现在我得先讲讲，怎么来实现迭代。

We're going to see variations of this, we're going to see a variation of it called recursion, a little later on, but for now we're just going to talk about how do we do iterations.

youdao

We're going to see variations of this, we're going to see a variation of it called recursion, a little later on, but for now we're just going to talk about how do we do iterations.

我们稍后会去，看它的变量,它的所谓的递归数的变量，但是现在我得先讲讲,怎么来实现迭代。

麻省理工公开课 - 计算机科学及编程导论课程节选