riverhead的用法和樣例：
例句
用作名詞 (n.)
- Riverhead areas have an especial status and Very important function in ecological, economical and social development in China.
江河源區在我國經濟社會發展和生態環境保護與建設中具有十分重要的地位和作用。 - Chaihe is an important riverhead source in Tieling, so its eutrophic cannot be ignored.
柴河水庫作為鐵嶺市重要的飲用水源，其富營養化問題不容忽視。
