placentaladj.胎盘的；胎座的n.有胎盘哺乳动物placentan.胎盘；胎座placenta velamentosa帆状胎盘placental hemangioma胎盘血管瘤placental thrombosis[医] 胎盘血栓形成placenta respiration胎盘呼吸placenta panduriform[医] 提琴状胎盘placenta velamentous帆状胎盘placenta trophoblast胎盘滋养层placental efficiency胎盘效率placental infarctionn.胎盘梗塞placenta incarcerata嵌闭胎盘