I can calculate the motions of the heavenly bodies, but not the madness of people.
A good abstraction is one that emphasizes the important details and suppresses the unimportant ones.
一个好的抽象是强调重要细节并抑制不重要细节的抽象。
一个物理符号系统具备一般智能行为的必要和充分条件。
In the internet industry, the only constant is change itself.