year by year,year after year的区别～具体点哈．
网友回答
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.
======以下答案可供参考======
供参考答案1:
year by year意为“逐年地、年复一年地”,表示逐年转变,强调动作
year after year意为“每年、年年”,常表示每年重复,强调动作的重复。