短語詞組短語boundary of river and sea 河海分界boundary between river and sea 河海分界線a boundary river 國境河boundary river detail 國境河national boundary river 國界河流Heilongjiang boundary river 界河黑龍江trans -boundary river 跨界河流boundary river banks collapse 界河坍塌County Boundary River 兩縣界河 返回 boundary river