Why do we often have to wait until things lost only know how to cherish?

为什么我们往往要等到眼前的事物即将消失才会懂得珍惜？

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When they sing a beautiful elegy to youth, a lament for all the things lost along the way, many were in tears.

当他们唱起动人的青春挽歌，悼念一路走来错失的所有，许多人都流下了眼泪。

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Sometimes things lost can't be recovered again.

有时候东西失去了就再也找不回来了。

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People who have lost their ability to do many things are sometimes able to regain some of these abilities with treatment.

VOA: special.2010.11.02

Among the things that are lost for a long time, there is writing.

在长期遗失的事物中,包括文字材料

耶鲁公开课 - 古希腊历史简介课程节选

What he proposes is that we have become so precise about nutrients, and so concerned about the things that are in food, we've lost sense of what food is.

他认为我们越来越关注营养,关注存在于食物当中的物质,却忽略了食物本身

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Things lost in time.

FORBES: Buffering? Never Heard Of It ...

But I've also learned that sometimes other things are lost, as well, and even if they don't matter as much as the human suffering, they matter just the same.

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Reality check: There are worse things than a lost device .

FORBES: The Ultimate Tech Nightmare: A Lost iPad