这些名词均含“胸，胸部”之意。
breast : 指人或动物的胸部或胸部的前面，也指男人或女人的乳房。
- When a woman becomes pregnant her breasts tend to grow larger.
女性怀孕后，乳房会增大。 - breast cancer
乳腺癌 - Do you think she's had breast implants?
你觉得她做过隆胸手术吗？ - A robin is easy to identify because of its red breast.
知更鸟因其胸脯是红色的很容易辨认。 - The dagger entered his breast.
匕首插入了他的胸膛。
bosom : 文学用词，与breast同义，特指女性的乳房，也可用作比喻。
- a large/ample bosom
大／丰满的乳房 - She held him tightly to her bosom.
她把他紧紧地拥在胸前。 - A dark jealousy stirred in his bosom.
他内心生出一阵恶毒的嫉妒。
chest : 指胸膛，即肋骨所包围的部分。
- He was shot in the chest at point blank range.
他被近距离射中胸部。 - He folded his arms across his chest.
他双臂交叉抱在胸前。 - His shirt was open to the waist revealing a very hairy chest.
他的衬衫敞开到腰部，露出毛茸茸的胸膛。 - She went to the doctor complaining of chest pains.
她去看医生，说胸部痛。
