hilus

例句：

1. 1.The baby's belly button is a common site for bruises.
   婴儿的肚脐是常见的瘀伤部位。
2. 2. The doctor removed the foreign object from the child's umbilical cord.
   医生从孩子的脐带中取出了异物。
3. 3.The mother was worried about her newborn's health after birth.
   母亲在新生儿出生后担心其健康。