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 present is a fleeting moment, but the past is eternal."
Sustainability isn't an option—it's the foundation of our future.
The cosmos is also within us, we're made of star-stuff. We are a way for the cosmos, to know itself.
宇宙也在我们体内，我们都是星尘构成的。我们是宇宙了解其自身的途径。