A chorionic villus is a minute vascular projection on the fetal chorion. 絨膜絨毛是胎兒絨毛膜上的一種微小的血管凸出物。
Each villus is richly supplied with blood which passes through a network of tiny tubes called capillaries. 血液流過(guò)稱(chēng)為微血管的毛細血管網(wǎng)，豐富地供應給每一根絨毛。
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