这个词是什么意思？
The class of true jellyfish, in the phylum CNIDARIA. They are mostly free-swimming marine organisms that go through five stages in their life cycle and exhibit two body forms: polyp and medusa.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D037401 · MeSH 2026。
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