珊瑚礁是由历代以浮游生物为食的小水螅所遗留下来的碳酸钙沉积物而形成的。
Coral reefs are formed by deposits of calcium carbonate left by successive generations of tiny polyps which feed off plankton.
珊瑚王国。货架的珊瑚环绕太平洋岛国帕劳。珊瑚，小生物体相关的海葵，分泌碳酸钙，其中一个外骨骼变硬，并随着时间的推移形成珊瑚礁。
Shelves of coral surround the Pacific island of Palau. Corals, small organisms related to anemones, secrete calcium carbonate, which hardens into an exoskeleton and over time forms reefs.
珊瑚王国。货架的珊瑚环绕太平洋岛国帕劳。珊瑚，小生物体相关的海葵，分泌碳酸钙，其中一个外骨骼变硬，并随着时间的推移形成珊瑚礁。
Shelves of coral surround the Pacific island of Palau. Corals, small organisms related to anemones, secrete calcium carbonate, which hardens into an exoskeleton and over time forms reefs.
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