first-line

adjective
🔊/ˌfɜːst ˈlaɪn/
🔊/ˌfɜːrst ˈlaɪn/
[only before noun]
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  1. the first choice, especially when talking about choosing a treatment for an illness
    • Surgical removal of the tumours is the first-line therapy.手术切除肿瘤是一线治疗。
    • first-line drugs for treating malaria一线治疗疟疾的药物