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open line

adjective
🔊/ˌəʊpən ˈlaɪn/
🔊/ˌəʊpən ˈlaɪn/
open-line
[only before noun]
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  1. relating to a radio or television programme that the public can take part in by phone（电台或电视节目）公众可打电话参与的，开放式的，互动式的
    • an open-line radio show互动式电台节目
    Topics TV, radio and newsc2

open line

noun
🔊/ˌəʊpən ˈlaɪn/
🔊/ˌəʊpən ˈlaɪn/
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  1. a phone communication in which conversations can be heard or recorded by others可被监听（或录音）的电话；开放线路电话