学习数学的唯一方法就是做数学。

Law is a system of rules, a union of primary rules of obligation and secondary rules of recognition, change, and adjudication.

"Political language is designed to make lies sound truthful and murder respectable, and to give an appearance of solidity to pure wind."

大脑是一种计算机，但它与我们习惯的计算机非常不同。