别像扶老太太过马路一样帮上帝过马路。

The price of freedom is eternal vigilance.

Immigration has a much smaller effect on native wages than most people believe.

"Education never ends, Watson. It is a series of lessons, with the greatest for the last."

Mental processes evolved to solve practical problems.

创新的关键不仅在于努力工作，更在于挑战现有理论的勇气。