With the depletion of high grade copper mineral resources, it has become very urgent to develop the discarded copper tailings.
随着高品位铜矿资源的日趋枯竭，高效开发铜尾矿变得越发迫切。
With the depletion of high grade copper mineral resources, it has become very urgent to develop the discarded copper tailings.
随着高品位铜矿资源的日趋枯竭，高效开发铜尾矿变得越发迫切。
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