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双音多频 shuāngyīn duōpín
commun., railw. Dual Tone Multi Frequency
IT dual-tone multi-frequency
space dual-tone multifrequency
tech. dual-tone multiple frequency
telecom. dual tone multi-frequency; dual tone multifrequency
双音多频 shuāngyīn duōpín
el. dual-tone multifrequency system
双音多频
: 3 phrases in 2 subjects
Aviation1
Telecommunications2