noun 下载 🔗分享 环礁，珊瑚岛。 A type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform. Atolls have a unique geology, so not all islands with a reef and a lagoon are atolls Examples : "The airplane flew over a beautiful atoll, a ring of small islands surrounding a calm, blue lagoon. " 飞机飞过一片美丽的环礁，那是由一圈小岛围绕着平静蔚蓝的泻湖所形成的。 geology geography environment nature ocean 与AI对话词汇游戏阅读练习
