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白垩纪
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白垩纪
Encyclopedia
理学
中生代
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Cretaceous Period
白垩纪
中生代最后一个纪(第三个纪)。约开始于1.37亿年前,结束于0.65亿年前。白垩纪形成的地层称白垩系(Cretaceous System)。
Biology
Cretaceous
白垩纪
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