—— 请按键盘 空白键 开始游戏 ——

Productive thinking is characterized by the sudden appearance of the solution as an insight.
It is no use saying, 'We are doing our best.' You have got to succeed in doing what is necessary.
Happiness is a state of mind, not a set of circumstances.
I don't think that everyone should become a mathematician, but I do believe that many students don't give mathematics a real chance.
The music is my voice when I can't speak.