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
시생대는 지구의 초기 역사에서 중요한 역할을 했습니다.sisaengdaeneun jiguuui choegi yeoksaui jungyohan yeokhal-eul haessseubnida.The Archean played an important role in the early history of the Earth.