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
지구의 간빙기는 기후 변화의 중요한 부분입니다.jiguui ganbinggi-neun gihoo byeonhwa-ui jungyohan bubun-imnida.The interglacial period of the Earth is an important part of climate change.