year after year 与year by year的区别两者均可表示“年年”，但含义和用法均有区别：year by year 通常用作状语，且含有逐渐(gradually)转变的意思；year after year 可用作状语，有时也可用作主语或宾语，它通常暗示时间之长久(for many many years)。比较：It’s always the same, year after year. 年年总是如此。He sent money year after year to help the poor. 他年年送钱帮助穷人。Prices tend to rise year by year. 物价总是一年一年地往上涨。Year by year their business grew. 他们的生意一年一年地发展了起来。

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