—— 请按键盘 空白键 开始游戏 ——

数算练习告诉我们算术运算的原理,而不是单单的记忆和不断演算。
Simple things should be simple, complex things should be possible.
质量是企业的生命,是品牌的基础。
Wealth is not about having a lot of money; it's about having a lot of options.