Once, when I was on my way back to my hometown, I lost my purse without even knowing it.

有一次在我回家乡的路上，我把钱包弄丢了都不知道。

youdao

You once had a chance, but you lost it!

你曾经有机会，但是你错过了它！

youdao

Once she lost the pen, she picked it up and continued writing.

一旦她丢了笔，她把它捡起来继续写。

youdao

Many critics say Weezer has lost all connection to the alternative band it once was.

VOA: special.2009.11.20

So,Once they are lost in response to a toxic sound or to an antibiotic it cannot be regenerated by natural means.

一旦因噪音或抗生素遭受损失,就难以再生。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Actually, the truth is I sort of almost felt that once you were there, it's kind of easy to get lost there, to forget about it.

实际情况是,我觉得一旦你生活在那里，似乎很容易忘记这种冲突。

普林斯顿公开课 - 人性课程节选

Some of Mr Menem's opponents have long argued that his efforts to cling to office have been motivated by fear of sleaze-related prosecution once he lost it.

ECONOMIST: Argentina��s awkward transition

Trump coaches Richard on how to amass a fortune, and then how to do it again once you've lost it all.

CNN: The Quest for wealth

Once we have lost it, we cannot get it back.

BBC: The perfect trip: China