day after day和day by day 许多朋友傻傻分不清

day after day日复一日

day by day 一天天地逐渐；每天;天天;逐日；逐渐

经典例子：

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。

The newspaper job had me doing the same thing day afterday.

这份报社的工作让我日复一日地做着同样的事。

The cities are bombarded day after day in an evident effort toforce 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。

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。

Day by day I am getting better and better

我在一天天地好转。

t's getting warmer day by day.

天气越来越暖和了。

The patient's condition is improving day by day.

病情逐日好转。

We will muddle through and just play it day by day

我们会应付过关的，就一天一天地演吧。

They built up love day by day.

他们的爱一天天逐步建立。

( His) income is increasing day by day.

收入日见增加。

The market is becoming brisker day by day.

市场日趋繁荣。

Transportation and communications are becoming easier dayby day.

交通日臻便利。

Our country is thriving and prospering day by day.

祖国日益繁荣昌盛。