—— 请按键盘 空白键 开始游戏 ——

The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
可持续性不仅仅是一种趋势,更是我们对后代的责任。
今天种下的每一棵树都是我们永远不会见到的后代的遗产。
The act of writing is an act of optimism. You wouldn't take the trouble to do it if you felt it didn't matter.
The most glorious moments in your life are not the so-called days of success, but rather those days when out of dejection and despair you feel rise in you a challenge to life, and the promise of future accomplishment.