submentum

例句：

1. 1.The surgeon performed a sternotomy to repair the patient's heart condition.
   外科医生进行了胸骨切开术来修复病人的心脏状况。
2. 2. The patient was placed in a prone position for the surgery.
   患者被放置在俯卧位进行手术。
3. 3.During the operation, the surgeon made a sternotomy to access the heart.
   在手术过程中，外科医生进行了胸骨切开术以进入心脏。