dialling tone
noun [ C usually singular ] UK uk/ˈdaɪ.ə.lɪŋ ˌtəʊn/ us/ˈdaɪ.ə.lɪŋ ˌtoʊn/ (US dial tone)
(电话)拨号音
a continuous sound that tells you that a phone is connected to the phone system and is ready to be used
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