n the source of a river
n. 源头, 上游
1. The headwaters of the river are located in the mountains.
这条河的源头位于山中。
2. Many animals depend on the clean water from the headwaters.
许多动物依赖于源头的清洁水源。
3. The researchers studied the headwaters to understand the river's ecosystem.
研究人员研究了源头以了解这条河的生态系统。