boob

例句：

1. 1. She was so embarrassed by her own boob that she couldn't speak.
   她对自己的乳房感到尴尬到说不出话来。
2. 2. The doctor told her to take a bath and apply some lotion to her boob.
   医生告诉她去洗澡并涂点乳液在乳房上。