鸭子法则

The Laws of Ducks

Duck Law NO.1 If it walks like a duck,talks like a duck,looks like a duck and quacks[呷呷叫]like a duck.it’s a duck.Restatement[重述]:All things are known by their attributes[特性].如果它走路像鸭子,说话像鸭子,样子像鸭子,叫声也像鸭子,那它就是一只鸭子。潜台词:事物的分类由自身的特性所决定。