如果你想看看这个国家的本质,你必须乘坐铁路。当你快速穿过时,看看外面,你会发现美国的真实面貌。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
Life is too short to wake up with regrets.