这个词是什么意思？
Mammals which nourish their young in utero by means of a complex placenta, and give birth to their young alive. They include PRIMATES; CARNIVORA, WHALES; RUMINANTS; BATS; and RODENTS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000073566 · MeSH 2026。
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