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
석기시대 사람들은 도구를 만들기 위해 돌을 사용했습니다.seokgisidae saramdeul-eun dogureul mandeulgi wihae dol-eul sayonghaessseubnida.Stone Age people used stones to make tools.