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浮游生物

被其他海洋生物食用的微小植物和动物。

海洋

一个很大的海域,覆盖了世界表面的 70%。

生态系统

动物和植物生活的区域,在这里它们相互依存。

珊瑚礁

海中的岩脊,是许多海洋动物和植物的家园。

海沟

海底深而窄的洞。

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