posterior surface of petrous part

例句：

1. 1. The surgeon carefully removed the posteriorsurface of the bone to repair the injury.
   外科医生小心翼翼地切除了骨头的后部以修复伤情。
2. 2. The patient's condition improved significantlyafter undergoing surgery on theposterior surface of the skull.
   患者在接受颅骨后部的手术之后，病情显著改善。
3. 3. Researchers are studying the anatomy of the posterior surface of the petrous part to better understand its function.
   研究人员正在研究椎体后部的结构，以更好地理解其功能。