The world is full of people who have never, since childhood, met an open doorway with an open heart.
这个世界上充满了自童年以来从未以开放的心态迎接开放之门的人。
有时候最真实的东西反而是你看不见的。
NP完全性的概念为理解问题的复杂性提供了一个强大的工具。
The greatest tragedy in life is not death, but the unlived life.
快乐的最好方式是跟随你的心。
"The best children's books are the ones that make children think."