Coral reefs are rocklike structures built by layers of coral organisms, called polyps.
珊瑚礁由珊瑚组织(珊瑚虫)层层相,类似。
Coral reefs are rocklike structures built by layers of coral organisms, called polyps.
珊瑚礁由珊瑚组织(珊瑚虫)层层相,类似。
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