这就好像口渴了才挖井，人死了才找医生。 

每本书都是作者和读者之间的对话。

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.

互联网是一个创新的平台，但它也需要负责任的使用。