—— 请按键盘 空白键 开始游戏 ——

In the context of computational learning, the concept of 'probably approximately correct' (PAC) learning provides a framework for understanding the efficiency and feasibility of learning algorithms.
The only way to change the world is to change yourself.
"The world is full of obvious things which nobody by any chance ever observes."
I think the best way to give back is to be a good person.