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telephone exchange

noun
🔊/ˈtelɪfəʊn ɪkstʃeɪndʒ/
🔊/ˈtelɪfəʊn ɪkstʃeɪndʒ/
(also exchange)
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  1. a place where phone calls are connected so that people can speak to each other电话交换台；总机；电话局