—— 请按键盘 空白键 开始游戏 ——

你无法改变过去,但你可以塑造未来。
You can't change the past, but you can shape the future.
The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.
Your most unhappy customers are your greatest source of learning.
Mathematics is a dialogue between the past and the present.