balance between tunneling and mining in coal pits是什么意思、英文翻译及中文解释
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
