The problem was that after successfully floating over one wave you find that there is another one behind it just as strong and ready to flood your boat.

VOA: special.2011.04.09

It just changes one pointer to point to the same thing as another.

这只是是一个指针指向,另一个指针指向的数据。

哈佛公开课 - 计算机科学课程节选