They're improving day by day.

他们在一天天地改进。

《牛津词典》

Day by day his condition improved.

他的健康状况一天天好转。

《牛津词典》

We will muddle through and just play it day by day.

我们会混过去的，就一天天混下去。

《柯林斯英汉双解大词典》

Day by day,the Union army of General William Sherman cut and burned its way across Georgia.

VOA: special.2009.12.03

And that's how you make exercise day by day.

你就这样每天练习。

英语学习就要这样 - SpeakingMax英语口语达人

Socrates writes in Book VIII, 561c, "speaking of the democratic soul, the democratic man, he also lives along day by day gratifying the desire that occurs to him, " at one time, drinking and listening to the flute."

苏格拉底在第，VIII，册的，561c，处讲到，“说到民主灵魂，民主人士，他们也是每天,都满足于所发生的欲望，偶尔小酌及聆听笛音“

耶鲁公开课 - 政治哲学导论课程节选

Day by day, Congress is asking more questions about the bailout of the financial industry.

NPR: Senators Skeptical Of Bailout Package

Tracking poll results reflect an overall pattern of campaign events that are unfolding day by day.

CNN: About the Tracking Polls

You carry on day by day, hoping that the government is trying to get this person.

WSJ: U.S. Forces Kill Osama Bin Laden