乳房的外形、大小随个体差异而不同,并不都是肥胖者大,瘦弱者小。双乳肥大指的是双乳与体形不相称而过于肥大。 乳房下垂是指乳头乳晕的位置低于乳房下面的反折线。乳头乳晕位于反折线以上为一般型乳房,若乳头乳晕与反折线同水平为I度下垂;若乳头 Breast shape, size varies with individual differences, not all obese, thin people are small. Big breasts refers to breast milk and body shape is not commensurate and overly hypertrophy. Breast sag refers to the location of the nipple areola below the fold line under the breasts. Nipple areola is located above the anti-fold line for the general type of breast, nipple areola and anti-fold line with the same level of I droop; if the nipple