Man, unlike any other thing organic or inorganic in the universe, grows beyond his work, walks up the stairs of his concepts, emerges ahead of his accomplishments.
人，与宇宙中任何其他有机或无机的事物不同，超越了他的工作，走上他的概念的楼梯，超越了他的成就。
控制的挑战在于在存在不确定性的情况下使系统工作。