短語詞組短語ancient annual surface runoff 古年地表逕流量mean annual average runoff 多年平均逕流量annual natural runoff 天然逕流量annual average runoff model 流域年均逕流模型annual mean runoff coefficient 多年平均逕流系數(shù)annual average runoff volume 多年平均逕流量average annual surface runoff 年均逕流量annual average runoff 年平均流量annual design runoff 設計年逕流 返回 annual runoff