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for subject
Telecommunications
containing
tone-busy
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in specified order only
English
Chinese
busy tone
占线音
busy tone
忙音
busy verification tone
占线证实音
busy-back tone
占线音
busy-back tone
忙音
line-busy tone
线路忙音
line-busy tone
占线音
tone-busy
有音示忙
有音表示占线
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