海岸线 :海水面与陆地接触的分界线。随着潮水的涨落而变动位置。一般指海边在多年的大潮时其高潮位所到达的线。海岸带 :海水对陆地作用的地带。分为 :( 1)海岸 ,现代海岸线以上狭窄的地带 ,包括上升的古海岸带 ;( 2 )潮间带 ,平均低潮面与平均高潮面之间的地带 ;( 3)水下岸坡 Coastline: The dividing line between seawater and land. Change as the tide changes. Generally refers to the seaside in the years of tide when the climax of its arrival line. Coastal zone: the sea water on the land area. Divided into: (1) the coast, the narrow strip above the modern coastline, including the rising ancient coastal zone; (2) the zone between the intertidal zone, the mean low tide and the average climax; (3) the underwater bank slope