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
북희귀선은 북반구의 중요한 지리적 경계입니다.bukhuigwiseoneun bukban-guui jungyohan jiri-jeok gyeonggyeimnida.The Tropic of Cancer is an important geographical boundary in the Northern Hemisphere.