| 单词 | gravel-mine |
| 释义 | > as lemmasgravel-mine gravel-mine n. ΚΠ 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 143 Gravel-mine, U.S. An accumulation of auriferous gravel. 1882 Rep. Precious Metals (U.S. Bureau of Mint) 13 Two of the principal gravel mines in the State. < as lemmas |
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