radiation therapy

例句：

1. 1. Radiation therapy is a type of treatment that uses high-energy radiation to kill cancer cells.
   放射治疗是一种使用高能辐射杀死癌细胞的治疗方法。
2. 2. Radiation therapy has been shown to be effective in treating certain types of cancer.
   研究表明，放射治疗在某些类型的癌症治疗中是有效的。
3. 3. The patient received radiation therapy for several weeks before undergoing surgery.
   患者在接受手术前接受了几周的放射治疗。