protractor ventralis muscle

例句：

1. 1. The surgeon used a protractor to elongate the patient's jaw.
   外科医生使用拉长器来延长病人的下巴。
2. 2. During surgery, the protractorwas used to expose the nervefor repair.
   在手术期间，拉长器被用来暴露神经进行修复。
3. 3. Theprotractor is essential for precise alignmentof the surgical instruments.
   拉长器对于精确对齐手术器械至关重要。