Information Summary： 1.The diameter of the lesion contained is approximately 0.5 to 1cm. 2. Applicable to the development of various brands of ultrasonic equipment; 3. Dimensions of unilateral breasts in adult females, including nipple structure; 4. It can meet the requirements of puncture simulation practice and teaching under ultrasound guidance, etc. 5. Exercise hand-eye coordination and basic skills training under ultrasound guidance.