—— 请按键盘 空白键 开始游戏 ——

局部和全局现象之间的相互作用是数论中反复出现的主题。
可持续发展不是一种选择,而是我们对后代的责任。
市场并不完美,但设计良好的市场接近完美。
What you actually pay for something is at least twice the listed price because of the energy, time, money needed to set it up, learn, maintain, repair, and dispose of at the end. Not all prices appear on labels. Actual costs are 2x listed prices.
健康的心灵和健康的身体同等重要。