—— 请按键盘 空白键 开始游戏 ——

数学的真正乐趣在于发现的过程,而不仅仅是结果。
Don't be afraid to make mistakes. If you're not making mistakes, you're not trying hard enough.
"La literatura es una forma de resistencia contra el olvido."
All mankind... being all equal and independent, no one ought to harm another in his life, health, liberty, or possessions.
Economic research should aim to inform real-world decision-making.