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
부관절은 두 관절 사이의 연결 부분을 의미합니다.Bugwanjeoreun du gwanjeol saiui yeon-gyeol bubun-eul uimi-hamnida.The subjoint refers to the connecting part between two joints.