反馈是鲁棒控制系统的关键。
The only limit to our realization of tomorrow is our doubts of today.
The man who is anybody and who does anything is surely going to be criticized, vilified, and misunderstood.
相机是几何地看，我们不是。
"The characters in my novels are not just creations; they are fragments of my soul, scattered on the pages."