Writing is a way of being in the world, a way of seeing it and understanding it.

I'm a black American, I am proud of my race. I am proud of who I am. I have a lot of pride and dignity.

决心：该做的事情一定要做，要做的事情一定做好。

The most important thing in science is not to solve problems, but to ask the right questions.

中心地的等级越高，其服务的区域越大，此类中心地的数量越少。

I write because I cannot scream.