—— 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.
学习不以学识渊博为尊贵,贵在能够所学的为正道。
Because I'm your mom, it counts the most because I know you the most.
Never put off till tomorrow what you can do the day after tomorrow.