Combinatorics is like the art of counting without actually counting.

天下不能由一个人治理，就设置官员来治理。

不要让昨天占据今天的太多时间。

艺术规则并非武断；它们建立在理性和事物的本质之上。

The true cost of overfishing is measured in empty nets and broken communities.

幸福是一种心态，而不是一系列环境。