superior constrictor muscle of pharynx

例句：

1. 1. The superior constrictor muscle plays a crucial role in maintaining the balance of the upper airway.
   咽上部的括约肌在维持上呼吸道平衡中起着关键作用。
2. 2. During sleep, the superior constrictor muscle helps to keep the throat open and prevent respiration from being obstructed.
   睡眠时，咽上部的括约肌有助于保持喉咙开放，防止呼吸受阻。
3. 3. In some cases, damage to the superior constrictor muscle can lead to difficulty swallowing or breathing.
   在某些情况下，咽上部的括约肌受损可能导致吞咽或呼吸困难困难。