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talkback

noun
🔊/ˈtɔːkbæk/
🔊/ˈtɔːkbæk/
 [uncountable] (specialist)
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  1. a system that allows people working in a recording or broadcasting studio to talk to each other without their voices being recorded or heard on the radio（录音或播音室的）内部联络系统，内部对讲系统Topics TV, radio and newsc2