IntheUnitedStatesalone,over100millioncell-phonesareth...
问题详情： IntheUnitedStatesalone,over100millioncell-phonesarethrownawayeachyear.Cell-phonearepartofaagrowingmountainofelectronicwastelikecomputersandpersonaldigitalassistants.Theelectronicwastestrea...