Styrofoam,orpolystyrene,isalight-weightmaterial,abou...
問題詳情: Styrofoam,orpolystyrene,isalight-weightmaterial,about95percentair,withverygood insulation(隔熱)properties,accordingto.Itisusedinproductsfromcupsthat keepyourdrinkshotorcoldtopackagingm...