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to phrases
tone dialing
el. 音调拨号; 单音拨号
IT 音调式拨号; 按钮式拨号
multimed. 音频拨号
tech. 按钮拨号
telecom. 电话机双音频拨号
tone dialing: 4 phrases in 3 subjects
Communications1
Multimedia1
Technology2

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