For a few days. Exactly from the day before yesterday.

有几天了，确切地说是前天。

youdao

Take care of unresolved problems from the day before.

处理好前一天尚未解决的问题。

youdao

I recognised the smaller one from the day before as he was once again wearing a woolly hat despite the heat.

我认出那个小一点的就是昨天看见过的，因为尽管天气很热，他还是戴了一顶绒线帽。

youdao

Tea Party activists see themselves as modern-day versions of the anti-tax protesters from before the American Revolution.

VOA: special.2010.03.06

In fact, I dug up this from a few years ago it was actually pretty fortuitous like the day before one of CS50s lectures the original iPhone was cracked.

实际上，我在几年前,发现了这个，这是相当意外的,就像在一个CS50演讲前一天,我的iPhone，坏掉了。

哈佛公开课 - 计算机科学课程节选

Hill,who also appeared Thursday before the Senate Foreign Relations Committee, said he hears from Iraqis every day who appreciate these sacrifices.

VOA: standard.2009.09.10

"Going back and looking, I apologize, " he said when questioned about his words from the day before.

CNN: Dodd: Administration pushed for language protecting bonuses

From an operating perspective, the day after the filing will not be materially different from the day before the filing.

WHITEHOUSE: THE WHITE HOUSE

Typically, people will be infectious from the day before their first symptoms until four to five days after the rash appears.

BBC: Merthyr measles outbreak inquiry