upper river

例句：

1. 1. The upper river is home to a variety of fish species.
   上流河是各种鱼类的家园。
2. 2. The upper river provides a natural habitat for many plant and animal species.
   上流河为许多植物和动物物种提供了自然栖息地。
3. 3.The upper river is often used for recreational activities such as fishing and boating.
   上流河常被用于钓鱼和划船等休闲活动。