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This is determined by the characters of metal production procedure as well as selective mining method itself.
这种情况是由于金属生产和选别式地下开采的特点而引起的。
youdao
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This is determined by the characters of metal production procedure as well as selective mining method itself.
这种情况是由于金属生产和选别式地下开采的特点而引起的。
youdao