smaller psoas muscle

例句：

1. 1.He was injured in the accident and required surgery to repair the smaller psoas muscle.
   他在事故中受伤并需要手术来修复较小的腰方肌。
2. 2.The doctor advised him to exercise regularly to strengthen the smaller psoas muscle.
   医生建议他定期锻炼以增强较小的腰方肌。
3. 3.During his recovery, he had to learn how to control the smaller psoas muscle to prevent re-injury.
   在他康复期间，他必须学会如何控制较小的腰方肌以防止再次受伤。