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忙音 mángyīn
IT busy signal
tech. engaged tone
telecom. busy tone; busy back; busy-back tone
gen. busy-buzz; busy-tone; busy-back-tone
线路忙音 mángyīn
el. line busy tone
忙音
: 21 phrases in 8 subjects
Artificial intelligence1
Communications1
Electronics4
General1
Information technology2
Programming1
Technology5
Telecommunications6