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
하학은 학생들이 기초적인 지식을 배우는 과정입니다.hahak-eun haksaengdeuri gichojik-in jisik-eul baeuneun gwajeong-imnida.Lower learning is the process where students acquire basic knowledge.