n.乳頭；牛奶瓶的奶嘴
Nipple inversion is quite common in normal breasts. 乳頭內(nèi)陷在正常乳房中也很常見。
Where has selling the rubber nipple not needing whorl cover? 哪里有賣不需要旋蓋的橡膠奶嘴？
