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open pit field
expl.
露天矿
从地表通过向下阶梯剥离开采金属矿、煤及其他非金属等矿床的作业形式
open-pit field
expl.
露天矿
从地表通过向下阶梯剥离开采金属矿、煤及其他非金属等矿床的作业形式
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