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
표수현위는 물의 흐름과 분포를 연구하는 학문입니다.Pyo-su-hyeon-wi-neun mul-ui heureum-gwa bunpo-reul yeongu-haneun hakmun-imnida.Surface hydrology is the study of the flow and distribution of water.