mainlined/ˈmeɪn.laɪn/形容词主流的(信念、方法等)mainline churches主流教会(铁路)干线的Three mainline railway stations were closed because of bomb threats.3个干线车站因炸弹威胁而关闭。/ˈmeɪn.laɪn/动词静脉注射(毒品)By now she was mainlining.她至今仍在注射毒品。想跟读,去练习