frontal dilators of the pharynx

例句：

1. 1.The anterior dilators were used to widen the opening of the skull.
   使用前庭扩张器来扩大颅骨开口。
2. 2. The anterior dilators were removed during the surgery to facilitate the procedure.
   在手术中移除了前庭扩张器以便于进行操作。
3. 3. The anterior dilators were designed to prevent herniation of the brain tissue.
   前庭扩张器的设计是为了防止脑组织脱出。