nipple retraction

• 乳头凹陷

nipple retraction的用法和样例：

例句

1. The inverted nipple, which may be congenital or acquired by trauma and inflammation, can lead to both functional and aesthetic problems.
   摘要乳头凹陷，可能是先天性的或是由伤害及发炎所引起，会引发功能及外观上的一些问题。