计算机科学的本质是研究算法及其效率。

I’ve played with a broken hand, a sprained ankle, a torn shoulder, a fractured tooth, a severed lip, and a knee the size of a softball. I don’t miss games because of a toe injury that everybody knows wasn’t that serious in the first place.

有些人即使没有存心做坏事，可事实上事情仍会做错，引起不幸的后果。凡是粗心大意、看不出别人的好心好意，而且缺乏果断的人，都一样能害人。