Cleverness is a gift， kindness is a choice.
数学的历史是人类心灵独创性和创造力的证明。
我永远相信，只要坚持，就一定能成功。
I don't believe in pessimism. If something doesn't come up the way you want, forge ahead. If you think it's going to rain, it will.
The future of coal lies not in its quantity but in how cleanly and efficiently we can use it.