This sewage-consuming biological process depends on a closely interrelated succession of species of animal plankton.
这种污水的生物净化过程就依赖着浮游动物种类的一种密切相关的演替。
Plankton are small drifting organisms, plant or animal, that have very little or no locomotive ability.
浮游生物是一种非常小的漂流生物，几乎没有或者完全没有移动能力的植物或者动物。
Plankton are small organisms, plant or animal, that drift in the sea with little or no locomotive ability.
海洋浮游生物是非常小的有机生物，漂浮在海面上，很少或不具备移动能力。
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