—— 请按键盘 空白键 开始游戏 ——

Sustainability isn't a trend—it's the new standard for business.
Suffering is the school of wisdom.
一个人固守道德而不能发扬光大,信仰主张又不能坚定不移,这种人有他不能算有,没有他不能算无。
To understand the arithmetic of algebraic varieties is to understand the symmetries hidden within them.