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
편동항행은 지리적 위치를 나타내는 중요한 요소입니다.Pyeondonghanghaeng-eun jirijeog wichi-reul natananeun jungyohan yoso-imnida.Easting is an important factor that indicates geographical location.