这个词是什么意思？
The family Phocidae, suborder PINNIPEDIA, order CARNIVORA, comprising the true seals. They lack external ears and are unable to use their hind flippers to walk. It includes over 18 species including the harp seal, probably the best known seal species in the world.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D046048 · MeSH 2026。
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