—— 请按键盘 空白键 开始游戏 ——

We must constantly look at things in a different way.
短缺乃是一种符号,它意味着价格被人为地保持在低于供求双方可以自由行事时的水平。
Understanding the computational complexity of learning problems is essential for developing efficient algorithms.
生活是一系列的选择,每个选择都有其后果。