当函数在尾部调用中调用自己时，方法更为简单。

When a function calls itself in a tail-call, the method is even easier.

youdao

在尾部调用之后除去栈结构的方法称为 尾部调用优化。

The idea of removing stack frames after tail-calls is called tail-call optimization.

youdao

可见，尾部调用使用了更多一些指令，但是它们可以节省相当多内存。

As you can see, tail-calls take a few more instructions, but they can save quite a bit of memory. There are a few restrictions for using them.

youdao

Let's go the other direction. And yes, I guess I'd better say s not 2, or we're going to get an error here. Again, in twenty-three checks.

这里我得说不能是2，否则要报错了，再一次，调用了23次,在这个例子里，它从尾部开始。

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