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
적란운은 폭우와 천둥을 동반하는 구름입니다.jeoklanun-eun pogu-wa cheondung-eul dongbanhaneun gureum-imnida.Cumulonimbus is a cloud that accompanies heavy rain and thunder.