—— 请按键盘 空白键 开始游戏 ——

可持续性不仅仅是一个目标,更是一种责任。
译文:古人最忌讳,表面对人顺从,背地里却反对。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
It takes a strong man to save himself, and a great man to save another.