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单词 θ211931
释义
society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > system of passages (2)
minework1900

A mine; any of the excavations which make up a mine (chiefly in plural). In early use also Military (in plural): †underground passages dug under an…

horizon1948

Mining. In horizon mining, a system of approximately horizontal tunnels lying in the same horizontal plane; the plane containing these tunnels.

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