This is the map that shows us where we're going. And this is the map that shows us where we've been. And it's never ever ugly.

学习数学的最好方法就是去做数学。

记忆是一种成就，一种更新。

度过生活的唯一方法就是笑着度过它。你要么笑，要么哭。我更喜欢笑。哭会让我头疼。