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
기간산업체는 국가 경제에 중요한 역할을 합니다.gigansaneopcheun gukga gyeongje-e jungyohan yeoghal-eul hamnida.Key industry companies play an important role in the national economy.