first-line
adjective/ˌfɜːst ˈlaɪn/
/ˌfɜːrst ˈlaɪn/
[only before noun]- the first choice, especially when talking about choosing a treatment for an illness
第一线：首选，尤其是在谈论选择疾病的治疗方法时 - Surgical removal of the tumours is the first-line therapy.
手术切除肿瘤是一线治疗方法。 - first-line drugs for treating malaria
治疗疟疾的一线药物
- Surgical removal of the tumours is the first-line therapy.