Huang Hai mean sea level

例句：

1. 1. The sea is a vast and mysterious place.
   大海是广阔而神秘的。
2. 2. He spent his childhood exploring the seashore.
   他小时候在海边探索过。
3. 3. The ship sailed across the wide sea.
   那艘船驶过了广阔的海洋。