half-tide level

例句：

1. 1. The ship's captain adjusted the sails to maintain a safe distance from the dangerous half-tide level.
   船长调整帆篷，以保持与危险半潮汐水平的安全距离。
2. 2. The scientists used a sophisticated tidal gauge to measure the exact position of the moon's orbitaround the Earth.
   科学家们使用精密的潮汐计来测量月亮围绕地球轨道的确切位置。
3. 3. The city's water supply relies heavily on the natural tides, which can be monitored by a tidal gauge installed at the coast.
   该市的供水严重依赖于自然潮汐，海岸上安装的潮汐计可以监测这些潮汐。