自由是人类参与自身发展的能力，是我们塑造自我的能力。
Freedom is man's capacity to take a hand in his own development. It is our capacity to mold ourselves.
The less I interfere, the better the painting becomes.
Every year of delay makes the problem harder to solve.
I don’t want to fall in love, I just want to fall asleep.
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。