—— 请按键盘 空白键 开始游戏 ——

The world is not a wish-granting factory.
不,不是富有。我是一个有钱的穷人,这不是一回事。
We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.
I never buy anything unless I can see a clear path to a 50% gain.