—— 请按键盘 空白键 开始游戏 ——

Liberty cannot be preserved without a general knowledge among the people.
The interplay between randomness and structure is a central theme in both mathematics and computer science.
每一本书都是一次旅行。
世界上最昂贵的东西是信任。赢得信任可能需要数年,而失去它可能只需要几秒钟。