—— 请按键盘 空白键 开始游戏 ——

权,然后知轻重;度,然后知长短。
用秤称一称,才能知道轻重;用尺量一量,才能知道长短。
Design is not just about making things beautiful, it's about making things work better.
Science is not just about discovery; it's about making a difference in people's lives.
A good mathematician is one who can see analogies between theorems; a great mathematician is one who can see analogies between analogies.