river net的用法和樣例：
例句
- The Congo River and its tributaries have formed a complete water system.
有剛果河及其支流形成的單一完整的水系。 - This article discusses the river Distribution and function of the Dayan Old Town by using historical Literature, and with site visiting.
利用歷史文獻資料，結合實地考察試圖討論古城的水系分佈特點，並總結其功能。
