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单词 θ6293
释义
the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material below (13)
holing-stuff1819

attributive, as holing-axe n., holing-stuff n. (see quots.).

floor1869

The stratum upon which a seam of coal, etc. immediately lies.

holing1882

concrete. The stuff underlying a coal (or other) seam picked out to undermine it.

undergoing1883

= holing, n. 2.

Subcategories:

— below coal (9)
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