barrier reef

barrier-reef的词性：
n.（名词）

1. A long, narrow ridge of coral or rock parallel to and relatively near a coastline, separated from the coastline by a lagoon too deep for coral growth.
堡礁：一狭长的与海岸平行且相对靠近海岸的珊瑚礁或岩石，常被很深的、不适合珊瑚生长的环礁湖与海岸隔开