breast opening mallet

例句：

1. 1. The breast opening mallet is used to open the breasts during childbirth.
   乳房开口锤用于分娩时打开乳房。
2. 2. The doctor used the breast opening mallet to perform a minor procedure on the patient.
   医生使用乳房开口锤为患者进行了一次小手术。
3. 3. During labor, the nurse will use the breast opening mallet to help facilitate the birth process.
   在分娩过程中，护士将使用乳房开口锤帮助促进分娩过程。