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Terms for subject Drilling containing 坚硬 | all forms | in specified order only
ChineseEnglish
坚硬地层competent formation
坚硬地层competent bed
坚硬岩层取心工具hard rock coring tool
坚硬岩层钻进hard rock drilling
坚硬岩石地区hard rock country
钻坚硬地层hard drilling
钻遇坚硬地层get a bone

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