belt of phreatic fluctuation

例句：

1. 1. The belt of phreatic fluctuation is a critical area for waterquality monitoring.
   水文周期的带状波动区是水质监测的关键区域。
2. 2. The studyfocused on the belt of phreatic fluctuation in the region.
   该研究专注于该地区的水文周期带状波动区。
3. 3. Thebelt of phreatic fluctuation playsa crucial role in the local ecosystem.
   水文周期带状波动区在本地生态系统中起着至关重要的作用。