这个词是什么意思？
Threadlike vascular projections of the chorion. Chorionic villi may be free or embedded within the DECIDUA forming the site for exchange of substances between fetal and maternal blood (PLACENTA).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002824 · MeSH 2026。
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