—— 请按键盘 空白键 开始游戏 ——

Handy measure: the distance between your fingertips of your outstretched arms at shoulder level is your height.
The mathematician's best work is art, a high perfect art, as daring as the most secret dreams of imagination, clear and limpid.
我相信直觉。如果感觉不对劲,那很可能就是有问题。