That results from the sustained contraction of the facial muscles.
由于面部肌肉的持续收缩。
They result from sustained contraction of face and neck muscles, often due to fatigue, stress, or frustration.
肇因于面部和颈部肌肉的持续紧缩，通常是因过度劳累、压力和挫折而产生。
They result from sustained contraction of face and neck muscles, often due to fatigue, stress, or frustration.
肇因于面部和颈部肌肉的持续紧缩，通常是因过度劳累、压力和挫折而产生。
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