你无法回到过去改变开头，但你可以从现在开始改变结局。
You can’t go back and change the beginning, but you can start where you are and change the ending.
诗人真正的祖国是他的语言。
数学的语言是普遍的，超越了文化和语言的障碍。
真正的创新发生在技术与需求的交汇处。
Legal obligations are not merely moral obligations backed by sanctions.
The anarchic nature of the international system forces states to compete for power.
寻找意义是一种徒劳的努力。
