—— 请按键盘 空白键 开始游戏 ——

The only thing I'm sure of is that I know nothing.
书籍是飞机,是火车,是道路。它们是目的地,也是旅程。它们是家。
Every breakthrough is at first laughable and ridiculous. In fact if it did not start out laughable and ridiculous, it is not a breakthrough.
Mathematics is a living subject, constantly evolving and growing.