The nipples on someone's body are the two small pieces of slightly hard flesh on their chest. Babies suck milk from their mothers' breasts through their mothers' nipples.
例句
Sore nipples can inhibit the milk supply.乳头发炎会抑制出奶。
N-COUNT
(橡皮或塑料)奶嘴
A nipple is a piece of rubber or plastic which is fitted to the top of a baby's bottle.
例句
...a white plastic bottle with a rubber nipple.有橡皮奶嘴的白色塑料奶瓶