chemical sympathectomy

例句：

1. 1.The patient underwent a chemical sympathectomy to alleviate his pain.
   患者接受了化学交感神经切断术以缓解他的疼痛。
2. 2. The surgery was performed to remove thetumor and prevent further damage to the nerves.
   手术是为了切除肿瘤并防止进一步损害神经。
3. 3. The procedure is used to treatchronic pain conditions such as fibromyalgia.
   该程序用于治疗慢性疼痛条件，如纤维肌痛。