—— 请按键盘 空白键 开始游戏 ——

Investing in environmental technology is investing in the future.
The most important thing in mathematics is to understand the concepts, not just to memorize formulas.
失败并不总是错误,它可能只是一个人在特定情况下能做到的最好结果。真正的错误是停止尝试。