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Styrofoam,orpolystyrene,isalight-weightmaterial,abou...
问题详情: Styrofoam,orpolystyrene,isalight-weightmaterial,about95percentair,withverygood insulation(隔热)properties,accordingto.Itisusedinproductsfromcupsthat keepyourdrinkshotorcoldtopackagingm...