—— 请按键盘 空白键 开始游戏 ——

书是一扇门,你打开它,然后走进去。
"A book is a door. You open it. You step through."
矿业社区应该得到的不仅仅是临时工作—他们应该得到可持续的未来。
The process of discovery in mathematics is often more important than the result itself.
你唯一的限制就是你相信的限制。