mainline

1. Transitive(及物动词)Intransitive(不及物动词)

   to inject drugs directly into the bloodstream using a needle

   静脉注射

   • Some of her acquaintances intravenously inject heroin.

     她的一些熟人在静脉注射海洛因。

   • By that point, she was already using intravenous drugs.

     到了那个时候，她已经在静脉注射毒品了。

   • He developed serious health issues due to mainlining drugs.

     他因为静脉注射毒品而产生了严重的健康问题。

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common(常见)

1. pertaining to the most common beliefs, methods, or practices

   （信仰、方法等）主流的；主要的

   • mainline Protestant denominations

     主流的新教教派

   • This company holds a large share of the mainline market.

     这家公司占据了主流市场的很大份额。

   • reports from mainline media outlets

     来自主流媒体的报道

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transport(运输)

1. related to a principal railway line between major cities or towns

   （铁路）干线的；主要路线的

   • This train is a key mainline service.

     这列火车是主要的干线服务。

   • We need to upgrade the mainline railway infrastructure.

     我们需要升级干线铁路的基础设施。

   • He took the mainline train to London.

     他搭乘干线火车前往伦敦。