歌剧是一个美丽而非理性的世界。一个人可以用一生去聆听，却仍然不能理解所有的一切。
The opera is a beautiful and irrational world. One could spend a lifetime listening and still not understand everything.
In computing, turning the obvious into the useful is a living definition of the word 'frustration'.
A man without a homeland is like a nightingale without a song.
计算复杂性的研究不仅仅是关于问题的分类；它是关于理解计算本身的本质。