英语词汇“return busy tone”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	return busy tone
释义	return busy tone return busy tone [ri′tərn ′biz·ē ‚tōn] (communications) A signal returned to the register-sender that, in turn, returns a busy indication to the calling station.
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