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
다중심주의는 여러 중심이 동시에 존재하는 것을 의미합니다.dajungsimjuineun yeoreo jungsimi dongsi jeongjaehaneun geoseul uimihaemnida.Polycentrism means that multiple centers exist simultaneously.