coastline

例句：

1. 1.The sun sets over the vast expanse of the Pacific Ocean's coastline.
   太阳在太平洋的广阔海岸线上落下。
2. 2.The town is nestled between two beautiful beaches on the coast.
   这个小镇坐落在两个美丽的海滩之间，位于海岸线上。
3. 3.The coastal region is home to a thriving fishing industry.
   沿海地区是繁荣的渔业产业所在地。