• 1. medium hard rock: 中硬岩石
• 2. medium-hard rock: 中硬岩石
• 3. medium hard rock strata: 中硬岩地层

更多释义

• 1.For any music other than hard rock, this room style is a happy medium.
  这个类型的房间是个折衷方案，除了硬摇滚适合所有的音乐类型。
  dict.yoduao.com
• 2.But appropriate the blasting parameters of medium deep blasting in hard rock tunnel is always a technical problem need to be solved.
  而合理的硬岩巷道中深孔掘进爆破参数则一直是需要研究解决的技术难题。
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• 3.So the rock cuttabilities are divided into three levels as soft, medium soft and medium hard, based on which the rock cuttabilities along the tunnel is recognized.
  因此，将岩石可切割性划分为软、中软及中硬三个级别，对掘进过程中岩石的可切割性进行识别。
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