成功的妊娠有赖于充足的胎盘血液循环，如胎盘微血栓形成或胎盘梗死，均可导致不良妊娠结局。
Successful pregnancy depends on sufficient uteroplacental circulation. Placental thrombosis or infarction can result in adverse pregnancy outcome.
当她们暴露于污染的空气之中，污染物便会进入她们的血液并再透过胎盘及脐带进入胎儿的血液循环系统中，严重影响胎儿的成长及发育。
When exposed to ambient air pollution, pollutants will enter a pregnant woman's bloodstream and pollutants can then reach the foetus' circulation through the placenta and umbilical cord.
当粘连发生，胎盘内血液循环受阻将直接影响胎儿发育。
When placental adherence happens, blood circulation of villus in the placenta could be retard, and then the developing of fetus were affected.
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