It does not know to which container an iterator is bound, nor does it know how many elements are in a container.

编译器无法知道迭代器所关联的是哪个容器，也不知道容器内有多少个元素。

youdao

You got to feel it, see it, know how much you need it.

你需要感受它，看到它，了解你多需要它。

youdao

You got to feel it, see it, know how much you need it.

你需要感受它，看到它，了解你多需要它。

youdao