A country's coastline is the outline of its coast.
例句
This is some of the most exposed coastline in the world...这里的海岸线属于世界上最无遮蔽的一段了。Thousands of volunteers gave up part of their weekend to clean up the California coastline.几千名志愿者放弃周末的部分休息时间,来清理加利福尼亚州的海岸。
英汉词典释义
n.
海岸线;海岸地形 (或轮廓);沿海地带
The road follows the Pacific coastline.公路沿着太平洋海岸线延伸。The sea is eating away the coastline.海水侵蚀着海岸线。They sailed along the rugged coastline.他们沿着多岩石的海岸线航行。