这个词是什么意思？
The capability of producing yolk-filled eggs that hatch within the body, so that the young are born alive, but without placental attachment. This applies to certain species of REPTILES and FISHES.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D052285 · MeSH 2026。
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