stemflow

例句：

1. 1.The river's stemflow is a popular spot for birdwatching.
   这条河流的源头是观鸟的好地方。
2. 2. The engineer studied the stemflow to understand how water moves through the landscape.
   工程师研究了水流源头，以了解水是如何通过景观流动的。
3. 3. The company's stemflow is responsible for providing clean drinking water to millions of people.
   公司的水流源头负责为数百万人提供清洁的饮用水。