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
무균법은 수술 중 감염을 예방하는 데 중요하다.Mugyeonbeopeun susul jung gamyeomeul yebanghaneun de jungyohada.Asepsis is important for preventing infections during surgery.