—— 请按键盘 空白键 开始游戏 ——

If we want clean air and water, we must start by protecting our forests.
如果我们想要清洁的空气和水,就必须从保护森林开始。
梦想是人生的动力,没有梦想就没有方向。
In mathematics, the journey of discovery is often more rewarding than the destination itself.