国外主要矿业国家对地下金属矿山连续出矿运矿设备进行了深入的研究。
Research on continuous ore drawing and haulage equipment for underground metal mines has widely been done in main foreign countries with mining industry.
深部水平矿柱开采的稳定性问题，是地下金属矿山迫切需要解决的共性技术难题之一。
The stability of horizontal pillars in deep mining is one of the common technical challenges that should be solved urgently for underground metal mines.
金属矿山地下开采扩建合理生产规模的确定，是矿区开发过程中的一个重要决策因素。
The production scale of the underground metal mine is one of the decisive factors to be considered when the mine is enlarged.
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