river system的用法和樣例：
例句
用作名詞 (n.)
- During these journeys he discovered the connection between the Amazon and Orinoco river systems and surmised that altitude sickness was caused by lack of oxygen.
旅程中他發現亞馬遜河系與奧利諾科河系是相通的，並推測高山病起因於缺氧。 - Geographically, Jiangmen Municipality is located in an alluvial plain in river delta, with low hills dotted crisscrossed rivers and fertile soil.
江門市屬河流三角洲沖積平原，低山丘陵錯落其間，河網縱橫，土地肥沃。
