短語詞組短語middle -upper ordovician 上奧陶統(tǒng)Middle -Lower Ordovician carbonate rocks 中下奧陶統(tǒng)碳酸鹽巖Middle Cambrian -Early Ordovician 中寒武世middle ordovician -lower carboniferous 中奧陶統(tǒng)Cambrian -Middle Ordovician 寒武紀(jì)Lower -Middle Ordovician reservoir 中 返回 Middle Ordovician