1 one of the two soft round parts of a woman's body that can produce milk （女性的）乳房

2 a word used especially in literature for the top part of the front of your body, below the neck （尤为文学用语）胸膛

3 the front part of the body of a bird （鸟类的）胸脯 ☞picture on page C1 见C1页插图