—— 请按键盘 空白键 开始游戏 ——

The past is a place of reference, not a place of residence.
Sustainability isn't a choice; it's our responsibility to the planet and future generations.
电脑是工具,而不是思考的替代品。
A library is a cemetery of living books, each one waiting to be resurrected by a reader.
The study of L-functions is a reflection of the unity of mathematical knowledge.