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
，
整个口腔气体流通。
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Others may be less so, like the buccinator, a muscle that attaches your cheek to your teeth, or the body's tiniest skeletal muscle, a one-millimeter-long tissue fragment called the stapedius that's nestled deep inside the ear.
其他肌
就比较陌生了，比如颊肌，这是一种把你脸颊连接到牙齿上肌，还有身体上
骨骼肌，一片一毫米长组织材料，叫做镫骨肌，位于耳朵深处。
