millions

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Over millions of years,
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Over millions of years, 在数百万年的过程中

millions of over years
in a way the reptiles perfected millions of years ago.
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in a way the reptiles perfected millions of years ago. 爬行动物在数百万年前 将这种方法予以完善

perfected reptiles way millions of in the ago years a
have been one of nature's greatest spectacles for millions of years.
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have been one of nature's greatest spectacles for millions of years. 这样的聚集 一直是自然界最壮丽的奇观之一

nature's spectacles millions greatest been for of have one years
For tens of millions of years,
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For tens of millions of years, 数千万年来

tens millions for of years
Hundreds of millions of years of evolution,
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Hundreds of millions of years of evolution, 数亿年的进化

evolution hundreds millions of years
Millions of square kilometers,
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Millions of square kilometers, 数百万平方公里

kilometers square millions of
has been a feature of life on Earth for hundreds of millions of years.
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has been a feature of life on Earth for hundreds of millions of years. 数亿年来 一直是地球生命的特点

feature hundreds millions life been has for of earth on years a
Hundreds of millions of years after Anthracosaurus,
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Hundreds of millions of years after Anthracosaurus, 石炭鲵出现之后几亿年

anthracosaurus hundreds millions after of years
The evolution from fin to limb took millions of years.
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The evolution from fin to limb took millions of years. 从鳍到肢的进化用了数百万年

limb fin evolution took millions from of the to years
that has remained almost the same for hundreds of millions of years.
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that has remained almost the same for hundreds of millions of years. 已经保持了数亿年 几乎不变

remained hundreds same millions almost has for of that the years