radiation therapy will small sources

例句：

1. 1. Radiation therapy is a form ofcancer treatment that uses high-energy radiationto kill cancer cells.
   放射治疗是一种癌症治疗方法，使用高能辐射杀死癌细胞。
2. 2. Thepatient received radiation therapy for the pain inher back.
   病人接受了放射治疗来缓解她背部的疼痛。
3. 3. Radiation therapy has beenshown to be effective in treating certain typesof cancer.
   研究表明，放射治疗在某些类型的癌症治疗中是有效的。