subtidal line

例句：

1. 1. The subtidal line is a crucial boundary between the ocean and the land.
   潮汐线是海洋与陆地之间的重要分界线。
2. 2. The subtidal line is where the water level changes from high to low during the tide.
   潮汐线是潮水水位从高到低变化的地方。
3. 3. The subtidal line is also important for marine life as it provides shelter and food sources.
   潮汐线对海洋生物也很重要，因为它提供了庇护所和食物来源。