Reputation is a treasure that, once lost, can never be won back.

名誉如同珍宝，一旦失去，再难获得。

youdao

Laura once lost her wallet, and worried for days.

劳拉有一次丢了钱包，担心了好几天。

youdao

She once lost her wallet and walked to school each day.

她之前弄丢了钱包，于是每天步行上学。

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His ideas were so endless that he was not even troubled when he once lost some music he had been writing.

VOA: special.2009.02.08

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

We got lost once. We were trying to go to Spitalfields Market,

我们迷过一次路。我们想去斯毕塔菲尔德市场，

友好的英国人 - SpeakingMax英语口语达人

And, once lost, common sense can only be recovered, it seems, by way of science and peer-group review.

ECONOMIST: The sense of touch

American manufacturers are recapturing some markets once lost to imports, and pioneering new processes such as 3D printing.

ECONOMIST: America��s economy is once again reinventing itself

Lili had once lost a pair of silver bracelets, stolen by a man who claimed to be from Shanghai, like her.

NEWYORKER: The House Behind a Weeping Cherry