我认为质数就像生活。它们非常合乎逻辑，但你永远无法弄清楚其中的规则，即使你花所有时间去思考它们。

"I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do."

The wall is the oldest and most revolutionary architectural element.

一个力学问题只有被简化为代数问题时才算解决。