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
帮助唇
收缩，
支撑了整个口腔
流通。
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双语版 TED-Ed 演讲精选
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
较陌
，如颊，这是一种把你脸颊连接到牙齿上，
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。
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