常见例句用作形容词 (adj.)The story takes place 6500 years ago in the late Cretaceous period.故事发生在6500万年前的白垩纪晚期。用作名词 (n.)From the Cretaceous, Tarim basin began the new evolutional stage of foreland basin.从白垩纪初期开始 返回 cretaceously