year by year,year after year的区别～具体点哈．
问题描述：
year by year,year after year的区别～具体点哈．
答
两者都是一年又一年的意思year by year是指一年又一年中有变化,year after year是没变化,例：
he will make progress year by year if he works hard like this.
she goes to see her teacher year after year.