这个词是什么意思？
The capability of producing eggs (OVA) from which young are hatched outside the body. While mostly referring to nonmammalian species, this does include MAMMALS of the order MONOTREMATA.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D052287 · MeSH 2026。
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