单词 | working mine |
释义 | working mine Not only did it warn that its sole working mine may sit on barely half the gold it previously thought. Times, Sunday Times In a working mine, the radon level can be controlled by ventilation, sealing off old workings and controlling the water in the mine. Retrieved from Wikipedia CC BY-SA 3.0 At present there are five working mines three underground and two opencast mines. Retrieved from Wikipedia CC BY-SA 3.0 |
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