英语词汇“keyless ringing”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	keyless ringing
释义	keyless ringing keyless ringing [′kē·ləs ′riŋ·iŋ] (communications) Form of machine ringing on a manual telephone switchboard which is started automatically by the insertion of the calling plug into the jack of the called line.
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