unchanged

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Virtually unchanged since the great melt,
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Virtually unchanged since the great melt, 大融化之后几乎未曾改变

unchanged great virtually melt since the
virtually unchanged for hundreds of millions of years.
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virtually unchanged for hundreds of millions of years. 数亿年来几乎没有改变

unchanged hundreds millions virtually for of years
These flooded caves in Mexico have remained virtually unchanged for thousands of years.
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These flooded caves in Mexico have remained virtually unchanged for thousands of years. 墨西哥的这些水洞 几千年来几乎保持不变

unchanged remained caves mexico flooded thousands virtually these for of in have years
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