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.
其他的
们
比较陌生了，比如颊，这是一种把你的脸颊连接到牙齿上的，还有身体上最纤细的骨骼，一片一毫米长的组织材料，叫做镫骨，位于们耳朵的深处。
