学习数学的最好方法就是去做数学。

The true measure of success is not just profit, but the impact you leave on people and the environment.

Sustainability isn't a choice—it's a responsibility we owe to future generations.

对你帮助最大的书是那些让你思考最多的书。

I don't think President Bush is doing anything at all about Aids. In fact, I'm not sure he even knows how to spell Aids.

The only way to tell the truth is to speak with kindness. Only the words of a loving man can be heard.