反馈是鲁棒控制系统的关键。
Representation of the world, like the world itself, is the work of men; they describe it from their own point of view, which they confuse with the absolute truth.
可持续性不仅仅是一种趋势，更是我们对后代的责任。
爵士乐就是自由。你要记住这一点。