1·“The fossil record continues to show that the origin of modern placental mammals postdates or is at the Cretaceous-Paleogene boundary, ” he said.
他说：“化石记录一再证实现代胎盘类哺乳动物的起源是在白垩纪-早第三纪分界点的时候或那之后。
2·If the cells did cross the placental barrier, 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·Terbutaline crosses the placental barrier and blood-brain barrier of the fetus, which may lead to an autistic-spectrum disorder and other developmental disorders.
特布他林穿过胎盘屏障和胎儿的血脑屏障，可能导致自闭症系列障碍和其他精神障碍。
4·Pregnant women are also cautioned not to clean Kitty litter boxes because of the risk that Toxoplasma crossing the placental barrier and causing complications.
怀孕的女性也要注意，不要去倒猫沙盒，因为会有弓形虫穿过胎盘屏障，导致并发症的风险。
5·There are addition concerns of fetal and placental injury during the mother seizure which can lead to an increased risk of miscarriage.
在母亲癫痫发作期间还有其它对胎儿和胎盘的损伤，最终可能导致流产风险增加。