In the ebb, the part of the formation of atolls surface.
在落潮时, 部分的珊瑚礁露出水面形成珊瑚岛.
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Pacific Islanders, many living on coral atolls, are among those most at risk.
太平洋岛屿上的居民有很多住在珊瑚礁岛上, 他们面临的危险是最大的.
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In the Pacific Ocean there are many coral atolls that are ring like islands.
太平洋中有许多环状的珊瑚岛.
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