这个词是什么意思？
The species Delphinapterus leucas, in the family Monodontidae, found primarily in the Arctic Ocean and adjoining seas. They are small WHALES lacking a dorsal fin.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D050643 · MeSH 2026。
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