water conservation function的用法和樣例：
例句
- Subalpine forests in Western Sichuan are an important part of water conservation forests in Southwestern China.
川西亞高山森林是我國西南亞高山水源涵養林的重要組成部分。 - Study on Affection of Water Resources Protection Forest to Water Quality of Miyun Reservoir in Beijing, China.
北京密雲水庫水源涵養林對水質的影響研究。
