flow region

例句：

1. 1. Theriver flows through the city, providingfresh water for the residents.
   这条河流过城市，为居民提供新鲜的水资源。
2. 2. The scientistsstudied the flow region of the river tounderstand its dynamics.
   科学家们研究了河流的流动区域，以了解其动态。
3. 3. The flowregion is crucial for the survival of theecosystem.
   流动区域对于生态系统的生存至关重要。