—— 请按键盘 空白键 开始游戏 ——

The most profound discoveries in mathematics often come from the simplest observations.
Don’t let fear stop you from being who you are.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
有时候最难的事情和正确的事情是同一件事。
The cement industry must evolve or become obsolete.
你能花在孩子身上最好的东西就是时间。