I brought a T-shirt back for Mark.

我给马克带回来一件T恤衫。

《牛津词典》

Don 't back away from this chance.

不要放弃这个机会。

youdao

If that money isn 't back by Monday..

如果钱星期一还回不来。

youdao

The man took the box again, and took another long look, and gave it back to Smiley,and says, "Well,I don't see anything about that frog that is any better than any other frog."

VOA: special.2009.08.29

The objects don't get put back together," One possibility, of course, is simply to disagree with me about the facts.

物体不能再复原了“,一种可能性，当然，是简单地不同意我对于这些事实的观点。

耶鲁公开课 - 死亡课程节选

they get in a rut and they can't get back up.

他们就栽进去了，出不来了。

不要放弃 - SpeakingMax英语口语达人

But he didn't back down and even changed the settings on his cellphone to disable texting.

WSJ: Ground Rules for Digital Communication With Friends and Family

If ImClone doesn't back down, he expects that Bristol will take the biotech to court.

FORBES: Magazine Article

To make sure he didn't back out, he invited 30 of his corporate clients.

FORBES: Leadership