你有梦想,你必须保护它。
The essence of computational complexity is to understand the limits of what can be computed efficiently.
"I am not afraid of death, I am afraid of life."
无论多么聪明的人,在他年轻时都曾说过或做过一些事情,后来回想起来会感到不快,以至于如果可能的话,他会很高兴地从记忆中抹去。