rainfallKK [ˋreˏnfɔl] /ˈɹeɪˌnfɔl/名詞1降雨量、雨量Annual rainfall in this region has dropped by nearly twenty percent.這個地區的年降雨量已經減少了將近兩成。2降雨、下雨Heavy rainfall overnight caused flooding in several low-lying streets.整夜的大雨造成幾條低窪街道積水。