risorius muscle

• 笑肌

risorius muscle的用法和样例：

例句

1. The risorius and the buccinator muscles assist in the retraction of the lips, as well as support entrapment of air within the oral cavity.
   笑肌和颊肌帮助唇的收缩，也支撑了整个口腔的气体流通。