—— 请按键盘 空白键 开始游戏 ——

The speed of the leader determines the rate of the pack.
We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.
如果你不相信自己,就没有人会相信你。
Efficiency in extraction isn't just good for profits; it's good for the planet.