- 问题详情:Thinkingofthrowingyouroldcellphone?Thinkagain.Maybeyoushouldmineitfirstforgold,silverandothermetals.It’scalled“urbanmining”,searchingthroughthesmallpiecesofmetalinelectronicproductsforgold,silverandotherexpensivemetals.Itisagrowingindustryaro...
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