—— 请按键盘 空白键 开始游戏 ——

如果学习,不能够做到专心,这样就会变得杂乱无章。
The beauty of mathematics is that it is eternal, it doesn't change.
【释义】:天地日月无私地庇护、承载、照耀万物,体现了自然的无私和广博。
The internet is a tool that can be used for good or bad, and it's up to us to decide how we use it.