1, plump, proportionate, supple and elastic; 2, higher breast position, between the second and sixth ribs, the nipple is located between the fourth ribs; 3, the interval between the two nipples is greater than 20 cm, the diameter of the basal surface of the breast is 10-12 cm, the breast axis (from the basal surface to the height of the nipple) is 5-6 cm; the shape is upright, hemispherical.