opercular muscle

例句：

1. 1.The opercular muscle is responsible for opening and closing the mouth.
   关节肌肉负责开合嘴巴。
2. 2.The opercular muscle is a crucial part of the respiratory system.
   关节肌肉是呼吸系统的重要组成部分。
3. 3. The opercular muscle is also involved in swallowing and chewing food.
   关节肌肉还参与吞咽和咀嚼食物。