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
기술의 진부화는 기업의 경쟁력을 약화시킬 수 있다.gisul-ui jinbuhwa-neun gieob-ui gyeongjaengnyeok-eul yakwasikil su itda.The obsolescence of technology can weaken a company's competitiveness.