In fact, it is difficult or even impossible to develop and utilize a considerable amount of the balanced ore reserves due to the Iower grade indexes.
由于指标偏低，使相当数量的平衡表内储量，实际上目前很难甚至尚无法开发利用。
In fact, it is difficult or even impossible to develop and utilize a considerable amount of the balanced ore reserves due to the Iower grade indexes.
由于指标偏低，使相当数量的平衡表内储量，实际上目前很难甚至尚无法开发利用。
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