短語詞組短語hard shale formation 硬質(zhì)頁巖層medium hard rock formation 中硬巖層soft and hard interbeded formation 軟硬互層hard turn formation counter attack 同方曏急轉(zhuǎn)反擊abnormal hard tissue formation pulp 牙髓異常硬組織形成Abnormal hard tissue formation in pulp 牙髓異常硬組織形成hard formation cutting head 硬地層鑽頭extra -hard formation 極堅(jiān)硬地層deep well hard formation 深井硬地層 返回 hard formation