—— 请按键盘 空白键 开始游戏 ——

The challenge is to make the invisible visible.
It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom.
Every artist dips his brush in his own soul, and paints his own nature into his pictures.
The most elegant proofs are those that reveal the heart of the problem with clarity.
The mind is a dynamic system that constantly adapts to its environment.