"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."

I don’t need a reason to be successful.

农民增收不能只靠政策，更要靠市场机制和产业升级。

科学家不对自然法则负责，但他的工作是找出它们如何运作。