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.
病毒可透过胎盘，可能严重妨碍胎儿器官的发生。
The virus traverses the placenta and, may seriously interfere with organogenesis.
结论MCLR可透过胎盘屏障造成肝、肾等脏器损伤，可能在胚胎期就已形成肝癌高发基础。
Conclusion MCLR passes through the placental barrier and causes damage in kidney and liver, which may be the basis of high incidence of liver caner in the fetus phase.
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