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单词 tin-witts
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tin-witts
tin-witts n. see quots.
ΘΚΠ
society > occupation and work > materials > raw material > mineral material > ore > [noun] > tin ore > types of
black tin1602
tin-witts1853
witts1853
1853 A. Ure Dict. Arts (ed. 4) II. 858Tin witts’: the ore obtained from the stamp floors.
1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 186 Tin-witts, Corn[wall], the product of the first dressing of tin-ores, containing, besides tinstone, other heavy minerals (wolfram and metallic sulphides).
extracted from tinn.
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