contraction of levator ani muscle

例句：

1. 1. The muscle contractedas the person moved.
   随着这个人移动，肌肉收缩了。
2. 2. The doctor prescribed medication totreat the patient's condition.
   医生开药治疗病人的状况。
3. 3. The gradualcontraction of the muscles is a signof fatigue.
   肌肉逐渐收缩是疲劳的迹象。