| 单词 | mass copper |
| 释义 | > as lemmasmass copper mass copper n. copper occurring naturally in large masses. ΚΠ 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 686 The mass mines furnish beside the mass copper a considerable quantity of barrel work and very little mineral. 1927 Q. Jrnl. Econ. 41 685 (note) Mass copper is native copper in masses weighing up to a number of tons. 1979 Amer. Hist. Rev. 84 1167/1 Perhaps the author confuses the C and H conglomerate ore with old ‘mass’ copper. < as lemmas |
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