—— 请按键盘 空白键 开始游戏 ——

The books that we reread the most are the ones that most clearly describe the world we already know.
我不是说唱歌手,我是个领袖。
I am not trying to imitate a photograph, I am trying to make one.
We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.