—— 请按键盘 空白键 开始游戏 ——

数学不是观赏性运动,你必须参与其中才能理解。
You don't pass or fail at being a person, dear.
"History is not the past. It is the method we have evolved of organizing our ignorance of the past."
You have to be willing to work hard and stay focused on your goals.