bones of free lower limb

例句：

1. 1.The surgeon removed the bones of the free lower limb to save the patient's life.
   外科医生移除了自由下肢体的骨头，以拯救病人的生命。
2. 2. The researcher analyzed the bones of free lower limbs to study their structure and function.
   研究者分析了自由下肢体的骨头，以研究其结构和功能。
3. 3. The scientist discovered new evidence that could help us understand the evolution of the free lower limbs.
   科学家发现了新的证据，可以帮助我们理解自由下肢体的进化。