back-channel

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释义

后门途径，非正式(或非正规)(外交)途径，非正式渠道，秘密渠道
using a different or unofficial method of communication

例句
Jane: I need LaRoche's suspect list which you, with all your back-channel contacts, can get me.(The Mentalist)
简：我需要你通过你的后门渠道，帮我搞到拉罗切的嫌疑人名单。（超感神探）