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单词 θ6350
释义
the world > the earth > minerals > mineral deposits > [noun] > vein > perpendicular (2)
rakec1584

Mining. A principal vein of ore that is more or less vertical. Cf. rake-vein, n.

rake-vein1789

= rake, n.3 3.

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更新时间:2024/11/11 1:07:29