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回铃音 huílíngyīn
commun., railw. ring back tone
telecom. ringback tone
telecom., amer. ring-back tone
telecom., brit. audible ringing tone; ringing tone (按:CCITT《 蓝皮书》将 ringing tone 译为"振铃音"，但其含义就是"回铃音"， 容易造成误会)

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