可持续发展不仅仅是一个流行词，更是我们对后代的责任。
"Every child is a different kind of flower, and all together make this world a beautiful garden."
The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.
寻找互反律是数学史上的一个基本主题。
Don't let fear write your story.
The best way to solve a problem is to find a way to make it irrelevant.
All thinking men are atheists.
如果你做了一次，人们会称之为意外。如果你做了两次，他们会称之为巧合。但如果你做了三次，你就证明了一个自然法则。
The idea of America is so important to me. It's about freedom, democracy, and the ability to create your own destiny.
If there was less sympathy in the world there would be less trouble in the world.
Self-education is, I firmly believe, the only kind of education there is.