sea plain

例句：

1. 1. The sea plain stretches as far as the eye can see.
   海平线延伸到眼睛能看到的地方。
2. 2.The ship sailed over the sea plain.
   船驶过海平线。
3. 3. The sun sets over the sea plain, casting a golden glow across the land.
   太阳在海平线上落下，给陆地投下金色的光辉。