The secret to eating less and being happy about it may have been cracked years ago—by McDonald's.

吃得少并对此感到快乐的秘诀可能在几年前就被麦当劳破解了。

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Linda's father has kept this notebook as a secret these years and the notebook has become yellow.

这些年来，琳达的父亲一直秘密保存着这个笔记本，本子已经变黄了。

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Perls has found that in centenarians, it's principally genes that are the secret to extra years.

波尔斯发现，在那些百岁老人中，多活那些年的秘密主要在于基因。

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But the invasion never came. For years,American scientists had been developing a secret weapon,the atomic bomb.

VOA: special.2011.06.23

These documents from the Army and Marine Corps included secret reports from the past six years.

VOA: special.2010.07.31

He kept the bad news a secret for more than three years.

VOA: special.2010.02.07

He claims that he and the Toaster developed the secret signal over the many years that Mr. Jerome has been watching.

WSJ: A Midnight Dreary for Those Who Seek Tell-Tale Signs of Poe's Elusive 'Toaster'

To keep treasure-hunters away, the find remained a secret for two years while archaeologists scoured the area of the melt-back and analysed the finds.

BBC: [an error occurred while processing this directive]

To do so, he is studying as many pairs of venerable siblings as possible, in the hope that the genes they have in common hold the secret of their advanced years.

ECONOMIST: Centenarians