先看这2个词组的解释：
year after year
年年；每年
every year for many years
year by year
一年一年地；每年；年复一年
as the years pass; each year
它们的解说不同，说明它们看起来都有：“逐年，一年一年地”含义，但是，使用场合完全不同，year after year表示的是年年重复，毫无变化；year by year表示的是虽年年发生，但是年年都有变化发生。另外，year换成 day时，含义和区别是相类似的。看看例句，来琢磨它们的使用场合吧：
You keep on amazing me, year after year, the same old ways.
你不断地给我同样的惊喜，年年如此。
《柯林斯高阶英汉双解学习词典》
Regulars return year after year
老主顾每年都会再来。
《柯林斯高阶英汉双解学习词典》
Year after year I have a birthday present from my parents.
我每年都从父母那里得到一份生日礼物。
Don’t plant rice year after year in the same field.
不要在同一块地里年复一年地种植水稻。
The department has been shrinking year by year because of budget cuts.
这个部门因为预算削减而逐年萎缩。
《柯林斯高阶英汉双解学习词典》
This problem has increased year by year
这个问题一年比一年严重。
《柯林斯高阶英汉双解学习词典》
Year by year a few of these slang terms prove so useful that they graduate into respectable society.
年复一年，这些俚语中的一些证明是十分有用的，因而逐渐进入了上流社会。
《汉英大词典》
Since production has risen steadily, the personal income of the communemembers has increased year by year.
由于生产不断发展，社员们收入逐年增加。
《汉英大词典》
Life has been getting better year by year.
日子一年胜似一年。
《汉英大词典》
Year by year great swathes of this small nation's countryside disappear.
年复一年，这个小国家的乡村面积正在一片片地大量消失。
《柯林斯高阶英汉双解学习词典》
Year by year their affection for each other grew stronger.
年复一年，他们对彼此的爱愈加强烈。
Year by year we grow a little older.
我们会逐年变老。
I waited for news, day after day, expecting to hear.
我日复一日地等着，期待能听到消息。
《柯林斯高阶英汉双解学习词典》
The newspaper job had me doing the same thing day after day.
这份报社的工作让我日复一日地做着同样的事。
《柯林斯高阶英汉双解学习词典》
The cities are bombarded day after day in an evident effort to force their surrender.
那些城市遭到日复一日的炮轰，目的显然是要逼他们投降。
《柯林斯高阶英汉双解学习词典》
I live for the moment, day by day, not for the past.
我活在当下，过一天算一天，而不是活在过去。
《柯林斯高阶英汉双解学习词典》
Day by day I am getting better and better
我在一天天地好转。
《柯林斯高阶英汉双解学习词典》
It's getting warmer day by day.
天气越来越暖和了。
《汉英大词典》
The patient's condition is improving day by day.
病情逐日好转。
《汉英大词典》
( His) income is increasing day by day.
收入日见增加。
《汉英大词典》
The market is becoming brisker day by day.
市场日趋繁荣。
《汉英大词典》
Transportation and communications are becoming easier day by day.
交通日臻便利。
《汉英大词典》
Our country is thriving and prospering day by day.
祖国日益繁荣昌盛。
《汉英大词典》
The output is increasing year by year.; Production has been increasing year afteryear.
产量逐年上升。
《汉英大词典》
Output increases year after year.
产量连年上升。
《汉英大词典》
最后二例句正确性值得商榷，请大家讨论。
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