—— 请按键盘 空白键 开始游戏 ——

The farmer is the only man in our economy who has to buy everything at retail, sell everything at wholesale, and pay the freight both ways.
学习的挑战不仅在于记忆,还在于从具体例子中归纳出更广泛的概念。
以眼还眼,世界只会更盲目。