It was suggested that swainsonine could damage placenta and endanger directly fetuses through placentalbarrier.
由此证明，苦马豆素能损害胎盘并通过胎盘屏障直接作用胎儿。
2
If the cells did cross the placentalbarrier, the child's immune system should have recognised them as foreign invaders and destroyed them.
如果癌细胞确实穿过胎盘屏障，孩子的免疫系统应该会将它们视为入侵者，从而消灭它们。
3
Pregnant women are also cautioned not to clean Kitty litter boxes because of the risk that Toxoplasma crossing the placentalbarrier and causing complications.