反馈是鲁棒控制系统的关键。
人生的主要任务就是:识别和区分事物,这样我就能清楚地告诉自己哪些是外部不可控的,哪些是我实际可控的选择。
The key to a happy life is not in avoiding problems, but in learning how to deal with them effectively.
The past is not dead, it is not even past.