some day's you are the doy,some day's you are the hydrant!的含义是什么?

问题描述:

some day's you are the doy,some day's you are the hydrant!的含义是什么?
是一句英语名句,想了解它的真实含义.

是some days you are the dog,some days you are the hydrant!吧
直译为“有些日子你是狗,有些日子你是龙头.”相当于我们汉语中常说的一句话:天有不测风云,月有阴晴圆缺.