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单词 fast ground
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fast ground
fast ground n. Mining Obsolete rare solid or undisturbed rock lying underground; bedrock; cf. fast n.4 1.
ΚΠ
1753 Chambers's Cycl. Suppl. Shelf, a term used by the miners, in many parts of England, to express a distinction of the inner structure of the earth, so little known to philosophers, that they have no word to express it by. These workmen sometimes also express it by the term fast ground, or fast country.
1771 Encycl. Brit. III. 582/1 Shelf, among miners, the same with what they otherwise call fast ground, or fast country; being that part of the internal structure of the earth, which they find lying even, and in an orderly manner, and evidently having retained its primitive form and situation.
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