释义：日月依天而行，百谷草木依附地而生存。

"The truth is rarely pure and never simple."

每个故事都有一个目的，每个声音都值得被听到。

"The power of words lies not in their meaning, but in their ability to evoke emotions."

一个问题如果在计算机上可以快速解决，那么它属于P类问题；如果一个解可以快速验证，那么它属于NP类问题。