Part of the roof of a mine rendered dangerous by faults in the rock.
| 单词 | θ211959 | 
| 释义 | society > occupation and work > workplace > places where raw materials are extracted > mine > 			[noun]		 > part of roof rendered dangerous by faults (1)		 lype1835 Part of the roof of a mine rendered dangerous by faults in the rock. | 
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