Youth is the happiest time of your life, but only old people know this.

青春时代是一生中最幸福的时光，但只有老年人才知道这一点。

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Youth is something that only young people have, and that only old people know to treasure.

只有年轻人才拥有年轻，但是只有年长的人才知道怎样珍惜年轻。

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The Bupa survey also revealed France is the most "young-at-heart" nation, with almost one third of French respondents believing people are only old when they pass 80.

保柏调查还显示，法国是拥有“最年轻的心”的国家，有近三分之一的法国受访者认为，人只有过了80岁才算是老了。

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In nineteen eighty-six, Doctor Seuss wrote "You're Only Old Once."

VOA: special.2010.05.02

Does Milton only seem powerful because he has the force or the strength of the age-old literary canon behind him?

他之所以看起来充满力量,是因为身后的作品被人们奉为文学经典呢？

耶鲁公开课 - 弥尔顿课程节选

What does it mean, a new form comes about only to replace an old form which has ceased to be aesthetically viable?

但是新的形式代替旧的形式,来换取审美的重生是什么意思？

耶鲁公开课 - 文学理论导论课程节选

Creating a new Beatles album using only old four-track recordings was no easy task.

NPR: Something in the Way You Remix

Only old ladies answer the phone, complains Bill McInturff of Public Opinion Strategies, a Republican polling firm.

ECONOMIST: Political polls

The system for computing these payments is zero sum, no new money is being committed, only old money is being shuffled around.

FORBES: Medicare's New Plan To Punish Hospitals For Treating Expensive Patients Will Backfire