这个词是什么意思？
An infraclass of MAMMALS, also called Metatheria, where the young are born at an early stage of development and continue to develop in a pouch (marsupium). In contrast to Eutheria (placentals), marsupials have an incomplete PLACENTA.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D008394 · MeSH 2026。
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