世界上最好的粉丝是单向组合的粉丝。

浮动汇率并非解决所有经济问题的万能药，但它们可以提供一种有用的调整机制。

We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet, and never before have we had the power to do something about it.

在数学中，最简单的问题往往导致最深刻的发现。