placental barrier

• 胎盘屏障

placental barrier的用法和样例：

例句

1. Scientists had thought that even if cancer crossed the placental barrier, it would be rejected by the baby's immune system.
   传统的生物学理论认为，即使一个癌细胞能穿过胎盘屏障，它也将会被婴儿的免疫系统排斥。