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
인류는 역사시대에 들어서면서 문서 기록을 시작했다.inryuneun yeoksasidae-e deureoseomyeonseo munseo girogeul sijakhaetda.Humanity began to start written records during the historical period.