史记
优质工艺和道德生产可以共存；它们并不相互排斥。
Experience is a good school, but the fees are high.
The world is a labyrinth, and we are all just trying to find our way out.
发散级数是魔鬼的发明，基于它们的任何证明都是一种耻辱。
石头或许坚硬，但我们的决心必须更加坚定。