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单词 θ6302
释义
the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > soft material (3)
vees1672

The line of fracture marking the intersection of a coal seam and a fault; a deposit of earthy or fragmentary material following this line.

chun1747

Mining. A leading of clay or other soft soil setting between two hard sides and sinking down.

sink1747

Mining. A small vein of soft material (e.g. clay) set in hard rock and sinking down; = chun, n.1 1. Obsolete. rare.

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