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Aluminium is one kind of metal element with low density.
铝是一种低密度金属元素。
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The lead is a common non-ferrous metal element in the gold concentrate.
铅是金精矿中常见的有色金属元素。
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The lead is a common non-ferrous metal element in the gold concentrate.
铅是金精矿中常见的有色金属元素。
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