环礁（ Atoll reef ）：一般在热带大洋上，多在南太平洋和印度洋。围绕泻湖做一个环状的珊瑚礁。
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... atoll reef 环状珊瑚礁,环礁... coral atoll 珊瑚环礁 atoll texture 环礁结构,环形结构...
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underwater atoll reef 水下环礁
reef atoll 环礁
Lighthouse Reef Atoll 位于灯塔环礁区
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Pudong and Atoll Reef aquarium which is worth more to ah?
那个海洋馆与浦东的水族馆哪个更值得一去啊？
youdao
Also within the atoll-like reef system are picturesque islands that are mid-ocean pit stops for a variety of migrating seabirds, giving twitchers almost as much reason as divers to be excited about Apo Reef.
BBC: The undiscovered jewel of the Philippines
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