balance between tunneling and mining in coal pits是什么意思、英文翻译及中文解释
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balance between tunneling and mining in coal pits
词语: balance between tunneling and mining in coal pits
解释: 采掘比例关系
词典: 商务专业英汉词典
balance between tunneling and mining in coal pits 相关解释
采掘比例关系 balance between tunneling and mining (in coal pits);ratiobetween cutting and tunneling
采掘比例关系 balance between tunneling and mining (in coal pits);ratiobetween cutting and tunneling