海上

例句：

1. 1. The ship sailed across the vast seas.
   这艘船穿越了广阔的海洋。
2. 2. The sailors were sailing on a beautiful sea voyage.
   水手们正在进行一次美丽的海上航行。
3. 3. We need to take care of our environment while we're sailing on the sea.
   我们在海上航行时需要照顾好我们的环境。