musculus retractor costa

例句：

1. 1. The muscle contractor is usedto treat muscle spasms.
   肌肉收缩器用于治疗肌肉痉挛。
2. 2. The musclecontractor was designed toimprove the performance of athletes.
   肌肉收缩器被设计用来提高运动员的表现。
3. 3.The muscle contractor has been proven tobe effective in treating chronic pain.
   肌肉收缩器已被证明在治疗慢性疼痛方面是有效的。