浮游动物包含各种各样的小生物体，从单细胞原生动物到水母、磷虾和桡足类动物，为海洋食物链提供了基本的链接。
The zooplankton, which encompass a wide range of little organisms from single-cell protozoa to creatures such as jellyfish, krill and copepods, provide the basic link in the ocean food chain.
有些浮游植物是细菌，有些是原生生物，而大多数则是单细胞植物。
Some phytoplankton are bacteria, some are protists, and most are single-celled plants.
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