我们经常看见剧院里的人为剧中招收不幸的人伤心落泪，然而如果他们成为暴君，只会更加残暴的对待敌人。

国家是理性的行为者，在无政府状态的国际体系中寻求最大化其权力和安全。

The reward of seeing the joy on the faces of the parents is immense.

Science is not just about discovery, it's about persistence and collaboration.

Travel changes you. As you move through this life and this world you change things slightly， you leave marks behind， however small. And in return， life—and travel—leaves marks on you.

我们靠赚钱生存。我们靠给予生活。