—— 请按键盘 空白键 开始游戏 ——

Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.
It is a logically necessary truth that the future will resemble the past.
The sidelines are not where you want to live your life. The world needs you in the arena.
仇恨是缺乏想象力的表现。
The challenges in our lives are there to strengthen our convictions. They are not there to run us over.
The best way to learn mathematics is to do mathematics.