placentan.胎盘；胎座placentaire bruit[医] 胎盘[杂]音, 胎盘杂鸣placental hormone胎盘激素placental erosion胎盘溃疡placenta febrilis[医] 疟性脾肿大placenta percreta植入性胎盘placental barrier胎盘屏障placental souffle胎盘杂音placental infarct胎盘梗死Placenta remnants胎盘残留placenta obsoleta废用胎盘