数学的美在于它既精确又富有创造性。

I think， I think when it’s all over， it just comes back in flashes. You know， it’s like a kaleidoscope of memories. But it just all comes back. But he never does.

The best way to learn is by doing.

城市记得人们遗忘的事。

预测未来的最好方法就是创造未来。

You see, but you do not observe.