underground flow
/ˌʌndəɡɹˈaʊnd ˈtʃeɪmbə/
n
English · underground flow中文 · 地下径流Español · escorrentía subterráneaFrançais · écoulement souterrain
意味：Movement of infiltrated water that joins a watercourse on the surface or flows directly into lakes or the ocean.