—— 请按键盘 空白键 开始游戏 ——

数学中的每个问题都有解决方案;你只需要找到正确的路径。
Every problem in mathematics has a solution; you just have to find the right path.
Sustainable fishing is not an option; it is an obligation for future generations.
当今煤炭行业的挑战需要大胆的领导力和远见。