I used to think the world was broken down by tribes. Then I thought it was broken down by rich and poor. Then I thought it was broken down by stupid and smart. But I know now that it is broken down by people who are alive and people who are dead.

"Sometimes we get sad about things and we don’t like to tell other people that we are sad about them."

I don't need a reason to believe in myself.

集合起一百个伟大头脑，就会得到一个大傻瓜。

坚持是数学研究的关键，许多伟大的成果来自于长期的奋斗。

The mind is what the brain does.

The world is a beautiful place, but it has its thorns.

Every ton of coal we extract carries equal weight in responsibility.

能源的未来在于可持续性和创新。