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 chain of beautiful atolls, each a ring of tiny islands surrounding a calm, blue lagoon. " 飞机飞过一连串美丽的环礁，每一个都像一圈由细小岛屿组成的环，环抱着平静湛蓝的潟湖。 geography geology environment world nature ocean 与AI对话词汇游戏阅读练习
