“Cretaceous Period”的概念、定义、翻译、参考文献-科学参考

单词	Cretaceous Period
释义	Cretaceous Period Encyclopedia 理学中生代释 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）。
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