这个词是什么意思？
A class of invertebrate freshwater roundworms of the phylum NEMATODA. Most members are parasites with well-adapted body surfaces and sophisticated esophageal glands and pharynx.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000073560 · MeSH 2026。
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