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for subject
Rail transport
containing
上、下
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in specified order only
Chinese
English
上下
导坑法
top and bottom heading method
上下
料装置
loading and unloading device
上下
行列车
up-and down traffic
上下
行运行
up-and down traffic
上下
道装置
up and down track device
上供下回式系统
water-supply upward and backwater downward system
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