If I waited for perfection, I would never write a word.
在充满仇恨的世界里，爱才是最大的勇气。
Efficiency in energy production is the cornerstone of sustainable development.
人类能做的最好的事情就是帮助另一个人了解更多。
爱是自由的；承诺永远爱同一个女人，与承诺永远相信同一个信条一样荒谬。
Combinatorics is the art of counting without counting.
对黑洞的研究彻底改变了我们对空间和时间的理解。
The past is a foreign country; they do things differently there.
The future belongs to those who see possibilities before they become obvious.