抽象的目的不是模糊,而是创建一个新的语义层次,在这个层次上可以绝对精确。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
控制的目的是使系统在存在不确定性和干扰的情况下仍能按期望的方式运行。
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.