It's what we probably all have heard about and something that I will briefly try to describe, what's called the hermeneutic circle.

也许我们大家都听说过,我会简单介绍一下，那就是所谓诠释循环。

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How do I figure that out? Well I'm looping down the list, right? I'm walking down the list.

怎么算出来的呢？我在循环遍,历这个列表对吧？那要遍历这个列表。

麻省理工公开课 - 计算机科学及编程导论课程节选

If you're not updating some variable by incrementing it or decrementing it -- if you're not changing anything, presumably the conditions are never going to evaluate to false or the opposite, so you're just going to have an infinite loop, which might be your goal, but odds are it's not.

如果你不通过增加或减少它来改变一些变量,-如果你不改变什么，大概那个条件永远不会变成错误的,或相反的，所以你将得到一个无限循环，那可能是你的目标，但可能也不是。

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But that's, after all, what we've just described, in imagining the cycling with the memory loss.

归根结底，那正是我们对，想象中的循环失忆的描述。

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If you look at solve 2, it's going to solve2 run through the same kind of loop, printing out all of the answers.

我会让你们看一看,如果你在看，那将运行相同的循环。

麻省理工公开课 - 计算机科学及编程导论课程节选

How many times do I go through the loop?

那我执行了多少次循环呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

Well, this question mark becomes an O, this question mark becomes an O, and then the loop terminates 0 1 2 because it's iterating from zero to N so that's zero, 1, 2 and the length of the string is 3 so the loop terminates, but I remember that I needed to have this special sentinel value so I'm just going to put it there manually.

嗯，这个问号变成了，这个问号变成了0，然后循环结束了,以为迭代从0到N，那就是，字符串的长度是3，然后循环就结束了，但是我记得我需要这个特殊的标记值,所以需要手动的加上它。

哈佛公开课 - 计算机科学课程节选

And you'll find in the end that recursion is a feature of a language, it allows you to map some very obvious concepts like the phonebook tearing in half and half and half and half to actual code without it using some arbitrary human contrived framework like a for loop or a while loop which are much more stilted mechanisms.

最后你会发现递归是某种语言的一种特征,你可以用它将一些非常明显的思想,比如将电话簿划分为一半又一半,映射为实际代码，而不必使用那些人为框架,像for循环，while循环之类的,那是很呆板的机制。

哈佛公开课 - 计算机科学课程节选