1·Vernix caseosa a white cheesy substance has formed over the baby’s skin to protect it from its watery environment and to help ease her through the birth canal.
胎儿皮脂——白色的干酪质的物质——已经在婴儿表面形成了，它可以保护婴儿免受水环境的影响并帮助婴儿舒适地通过产道。
2·Each year between 50 000 to 100 000 women worldwide are affected by obstetric fistula, a hole in the birth canal.
全世界每年有5万至10万名妇女罹患产科瘘，即产道出现瘘孔。
3·A current theory in evolutionary biology suggests that we have to be born long before we are able to look after ourselves so that our oversized heads can navigate the birth canal.
最新的进化生物学理论指出，人类不得不在还没有能力照顾自己时出生，这样才能让我们硕大的头颅顺利的通过产道。
4·Patients can be infected by the mother's birth canal or amniotic fluid and.
小患者可以通过母亲的产道或羊水而被感染。
5·While your baby's bones have mostly hardened by now, his skull will remain pliable until after birth to allow him to fit through the birth canal.
现在婴儿的骨骼几乎全部都硬化了，他的颅骨直到出生之后将仍保持柔韧，这让他适合通过产道。