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
지동설은 태양이 우주의 중심이라는 이론입니다.jidongseol-eun taeyang-i uju-ui jungshim-ilaneun il-eon-imnida.Heliocentrism is the theory that the sun is the center of the universe.