| 单词 | copper ore |
| 释义 | copper ore A single train in 1915 carried out $345,050 worth of copper ore ($8.5 million today). Retrieved from Wikipedia CC BY-SA 3.0 They not only lacked adequate supplies of copper ore, but also did not have the technological skill needed to produce large sheets of malleable copper. The Times Literary Supplement Fortunately for the owners, a new vein of copper ore was discovered in 1884. The Times Literary Supplement By 1832 the mine's previously rich deposits of copper ore were substantially worked-out and the mine was in danger of closing. Retrieved from Wikipedia CC BY-SA 3.0 Copper ore was extracted for some time in the mid-1700s. Retrieved from Wikipedia CC BY-SA 3.0 |
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