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
대량화는 생산성을 높이는 데 중요한 역할을 합니다.daeryanghwa-neun saengsanseong-eul nopineun de jungyohan yeoghal-eul hamnida.Massification plays an important role in increasing productivity.