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
助唇
收缩，
支撑了整个
气体流通。
声明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
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.
其他肌肉我
较陌生了，如颊肌，这是一种把你脸颊连接到牙齿
肌肉，还有身
纤细骨骼肌，一片一毫米长组织材料，叫做镫骨肌，位于我耳朵深处。
