n.环礁湖,泻湖,咸水湖
He was grappling with an alligator in a lagoon.
他正在环礁湖里与一只短吻鳄搏斗。
The lagoon was pullulated with tropical fish.
那个咸水湖聚满了热带鱼。
An atoll is a circular reef surrounding a lagoon .
环礁是环绕着一个泻湖的环形礁石。