“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）。
随便看	circular birefringence circular body circular chart circular chessboard circular clay bar overlaying Circular Coin with a Circular Hole Circular Coin with a Square Hole circular cone circular congruence circular conical surface circular conoid circular convolution circular coordinate circular correlation circular cumulative causation circular current circular curve circular curve location circular curve of railway circular cylinder circular cylindrical bearing circular cylindrical coordinate circular cylindrical surface circular cylindrical wave circular definition

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