the land along a coast, especially when you are thinking of its shape or appearance海岸线；海岸地形（或轮廓）；沿海地带
a rugged/rocky/beautiful coastline崎岖的／多岩石的／美丽的海岸线
Measures were taken to protect the coastline from the oil spillage.已采取措施保护海岸线免受漏油的影响。
Synonyms coastcoast
beach
seaside
shore
coastline
sand
seashore
These are all words for the land beside or near to the sea, a river or a lake.
coastthe land next to or near to the sea or ocean:
a town on the south coast of Georgia乔治亚州南海岸的一个小镇
The coast road is closed due to bad weather.由于天气恶劣，滨海公路暂时封闭。
It is nearly always the coast, except when it is uncountable: That’s a pretty stretch of coast.
beachan area of sand, or small stones, next to the sea or a lake:
She took the kids to the beach for the day.她带了孩子去海滩玩一天。
sandy beaches沙滩
seaside(especially British English) an area that is by the sea, especially one where people go for a day or a holiday:尤指人们游玩、度假的海边、海滨：
a trip to the seaside去海滨旅行
It is always the seaside, except when it is used before a noun: a seaside resort.The seaside is British English; in American English seaside is only used before a noun. Instead of go to the seaside you can say go to the ocean/beach/shore.
shore(especially North American English) an area that is by the ocean or a lake, especially one where people go for a day or a vacation:
Let's go to the shore.我们去海岸吧。
The reef runs along the island's north shore.珊瑚礁沿着岛屿的北岸延伸。
coastlinethe land along a coast, especially when you are thinking of its shape or appearance:
California’s rugged coastline加利福尼亚崎岖的海岸线
sanda large area of sand on a beach:
We went for a walk along the sand.我们去沙滩上散了散步。
a resort with miles of golden sands有着绵延数英里金色沙滩的度假胜地
the seashorethe land along the edge of the sea or ocean, usually where there is sand and rocks:
He liked to look for shells on the seashore.他喜欢在海滨捡贝壳。
beach or seashore?用 beach 还是 seashore？Beach is usually used to talk about a sandy area next to the sea where people lie in the sun or play, for example when they are on holiday.Seashore is used more to talk about the area by the sea in terms of things such as waves, sea shells, rocks, etc, especially where people walk for pleasure.Patterns
along the coast/beach/shore/coastline/seashore
on the coast/beach/shore/coastline/sands/seashore