生活不仅仅是呼吸，而是行动。

"The past is never dead. It's not even past."

"I find people confusing. This is for two main reasons. The first is that people do a lot of talking without using any words."

人们不买你做什么，他们买你为什么做。

PID控制器的本质在于它能够根据系统的过去和现在状态预测其未来行为。