—— 请按键盘 空白键 开始游戏 ——

The past is a mirror, but we often see only what we want to see.
时节不寒冷,就不会知道松柏挺拔且郁郁葱葱的;事情不危难,就不会知道君子每日都在持守信念。
The history of mathematics is a history of human thought and progress.
实现明天理想的唯一障碍是今天的疑虑。