—— 请按键盘 空白键 开始游戏 ——

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
我不能教会别人任何事。我只能让他们思考。
The only thing we have to fear is fear itself.
The search for reciprocity laws is a fundamental theme in the history of mathematics.