Any of various unrelated aquatic animals, such as a jellyfish, cuttlefish, or crayfish.
水生动物与鱼无直接联系的水生动物，如海蜇、墨鱼或螯虾。
According to conventional thinking, simple animals, including sponges, jellyfish and corals, evolved step-by-step in a linear fashion into those with more complex bodies, such as mammals.
按照传统的见解，包括海绵、水母和珊瑚在内的简单动物按部就班发生演变，以线性方式形成像哺乳动物一样的更加复杂的生物体。
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.
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。
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