Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
클로로플루오로메탄은 오존층을 파괴하는 물질입니다.keulloropluorometan-eun ojoncheung-eul pagoehaneun muljil-imnida.Chlorofluoromethane is a substance that destroys the ozone layer.