—— 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。
科学的进步不仅依赖于个人的才华,也依赖于集体的努力。
But there is only one thing which gathers people into seditious commotion, and that is oppression.