region of umbilicus

例句：

1. 1.The baby's umbilical cord was wrapped tightly around his neck.
   婴儿的脐带紧紧地缠绕在他的脖子上。
2. 2. The umbilical cord is the connection between the mother and the baby during pregnancy.
   脐带是孕妇和胎儿在怀孕期间的联系。
3. 3.The umbilical cord is a fragile part of the human body that needs to be protected during childbirth.
   脐带是人体脆弱的一部分，需要在分娩时得到保护。