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
플루토늄은 핵무기와 원자력 발전에 사용됩니다.peullutoneun haengmugiwa wonjaryeok baljeon-e sayongdoemnida.Plutonium is used in nuclear weapons and nuclear power generation.