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microphone

mastery

UK /ˈmaɪ.kɹəˌfəʊn/ US /ˈmaɪ.kɹəˌfoʊn/nounverb

card 1 of 10 · fill in the blank

To protect the confidentiality of the interview, the journalist used a _____ microphone hidden inside a notebook so no one would know the conversation was being recorded.