常見(jiàn)例句用作形容詞 (adj.)The story takes place 6500 years ago in the late Cretaceous period.故事發(fā)生在6500萬(wàn)年前的白堊紀(jì)晚期。用作名詞 (n.)From the Cretaceous, Tarim basin began the new evolutional stage of foreland basin.從白堊紀(jì)初期開(kāi)始 返回 cretaceously