我们都是自己的幽灵，徘徊在我们曾经生活过的地方。
"We are all in the gutter, but some of us are looking at the stars."
学习数学的最好方法就是做数学。
我们通过DNA的线索彼此相连。
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."