—— 请按键盘 空白键 开始游戏 ——

The use of a program to prove the 4-color theorem will not change mathematics - it merely demonstrates that the theorem, a challenge for a century, is a finite problem.
"A writer's greatest tool is not the pen, but the ability to see the world through the eyes of others."
一本书是通往其他生活和其他世界的窗口。