—— 请按键盘 空白键 开始游戏 ——

You can't go through life with a catcher's mitt on both hands. You need to be able to throw something back.
最好的数学不仅正确,而且具有启发性。
我写作是为了理解我周围的世界。
We ought not to act and speak as if we were asleep.