leucotomy

例句：

1. 1. The patient underwent a leucotomy to relieve his pain.
   患者接受了白光手术以缓解疼痛。
2. 2. During the operation, the surgeon performed a leucotomy to remove the tumor.
   在手术过程中，外科医生进行了白光手术以切除肿瘤。
3. 3. The patient was given a local anesthetic before the leucotomy.
   在进行白光手术前，患者接受了局部麻醉。