translation.en: He was undergoing a treatment -- chemotherapy treatments -- and there's a related treatment called brachytherapy, where tiny, radioactive seeds are placed into the body to treat cancerous tumors.
translation.zh: 他在接受治疗， 化疗，还有个相关的疗法 被称为近距离放疗，很小，放射性的籽 被放到身体里，来治疗癌性肿瘤。