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monitor button /ˈmɒnɪtə ˈbʌtən/ n

中文：监听键

中文 · 监听键Español · tecla de menúFrançais · touche de contrôle
Meaning：Button used to check if a broadcast or receiving channel is free before transmitting.
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Found in these illustrated scenes（1）

Walkie-talkie

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