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
和颊帮助唇的收缩，
支撑了整个口腔的气
。
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精选 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
我们就比较陌生了，比如颊，这是一种把你脸颊连接到牙齿上，还有身体上最纤细骨骼，一片一毫米长组织材料，叫做镫骨，位于我们耳朵深处。
。”
