煤炭工业是美国的支柱。

当我们谈论一个词的“意义”时，首先我们在谈论一种特定的行为。

Innovation often happens at the boundaries of different fields.

I don't care if you're black, white, straight, bisexual, gay, lesbian, short, tall, fat, skinny, rich or poor. If you're nice to me, I'll be nice to you. Simple as that.

实现真正自由的唯一途径是通过教育和启蒙。

做一个世界的水手，游遍所有的港口。

科学中的每一个发现都是建立在我们之前无数人工作的基础上。

国际体系的无政府性质迫使各国将自身生存置于一切之上。