NP完全性的概念为理解计算问题的复杂性提供了一个强大的工具。

A sound mind in a sound body, is a short, but full description of a happy state in this World: he that has these two, has little more to wish for; and he that wants either of them, will be little the better for anything else. Men’s happiness or misery is most part of their own making. He, whose mind directs not wisely, will never take the right way; and he, whose body is crazy and feeble, will never be able to advance in it.

客户满意度毫无价值，客户忠诚度才是无价的。

I'm not running from my past; I'm running toward my future.

我做事情不是为了得到反应或赞誉，而是因为我热爱做这些事。

When we speak of 'meaning' a word， we are in the first instance speaking of a certain kind of act.

We have to be careful not to become stylists.

美的事物是永恒的喜悦：它的可爱与日俱增；它永远不会化为乌有。