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main-line

adjective
🔊/ˌmeɪn ˈlaɪn/
🔊/ˌmeɪn ˈlaɪn/
 [only before noun]
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  1. on an important railway line between two cities（城际）铁路主干线
    • a main-line station/train主线站/火车
    Topics Transport by bus and trainb2