tidal river reach

例句：

1. 1. The tidal river reaches are crucial for the local ecosystem.
   潮汐河流段对当地生态系统至关重要。
2. 2.The tidal river reaches are home to a diverse range of marine life.
   潮汐河流段是丰富多样海洋生物的家园。
3. 3.The tidal river reaches were once heavily polluted but have since been cleaned up.
   潮汐河流段曾经受到严重污染，但现在已经得到了清理。