mainline

主流的、主要的

Several mainline churches have lost members over the past decade.

过去十年，好几个主流教派的信众人数都在流失。

干线的、主线的

The village is finally connected to the mainline railway.

这个村子终于和铁路干线接上了。

干线、主线

Trains on the mainline were delayed for over two hours.

干线上的列车误点超过两个小时。

主流

His ideas were once radical but are now part of the mainline.

他的想法曾经很激进，现在却已成为主流。

静脉注射（毒品）口语

He admitted that he had been mainlining heroin for years.

他承认自己多年来一直在静脉注射海洛因。

大量摄取、狂灌口语、夸饰

I was mainlining coffee just to finish the report on time.

我为了准时交报告，简直是在狂灌咖啡。