以下为句子列表：
英文: Numerous muscles inserts into the orbicularis oris inferior and superior muscles, providing a flexible system for lips protrusion, closure, retraction, elevation, and depression.
中文: 轮颊肌为嘴唇上下方的肌肉，能让嘴唇的开合及前后伸缩自如。
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英文: Prof. of Physiology： Kiss is the juxtaposition of two orbicularis oris muscles in the state of contraction.
中文: 生理学教授接吻是两块口轮匝肌在收缩状态时并置在一起。
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