Each time we use a facial muscle, a groove forms beneath the surface of the skin, which is why we see lines form with each facial expression.
每当你使用面部肌肉的时候，皮肤下就会形成一道凹槽，这就是你作表情的时候，脸部出现线条的原因。
MAIN OUTCOME MEASURES: the rehabilitation time of facial expression muscle function was observed and the dynamic changes of conduction velocity of facial nerve were assayed.
主要观察指标：观察面部表情肌功能恢复的时间，检测面神经传导速度的动态变化。
As we facial muscle contraction and an over-active form of expression annoying wrinkles.
由于我们面部肌肉的过度活跃和收缩，形成恼人的表情皱纹。
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