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An air - filled sac or structure that aids in the flotation of an aquatic organism.

'气囊'.''水生动植物器官中用来帮助飘浮用的充满气体的囊或结构.

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One microscopic aquatic organism plays a major role in making life on earth possible: phytoplankton.

浮游植物--一种微小的水生植物,可能在地球生命的起源中发挥着重要的作用.

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