IntheUnitedStatesalone,over100millioncell-phonesareth...
問題詳情： IntheUnitedStatesalone,over100millioncell-phonesarethrownawayeachyear.Cell-phonearepartofaagrowingmountainofelectronicwastelikecomputersandpersonaldigitalassistants.Theelectronicwastestrea...