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
산업근로자는 경제 발전에 중요한 역할을 합니다.san-eob-geun-ro-ja-neun gyeong-je bal-jeon-e jung-yo-han yeok-hal-eul hamnida.Industrial workers play an important role in economic development.