史记
Every tree we plant today is an investment in tomorrow's clean air, stable climate, and thriving ecosystems.
The poet is the brother of the dreamer and the madman.
PID控制器是控制工程师的通用工具,适用于各种各样的过程。
The world is full of obvious things which nobody by any chance ever observes.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.