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占线信号
IT busy signal
tech. busy-back signal; engaged signal
telecom. busy-back; engaged; seizing signal
telecom., amer. seizure signal
占线〔忙音〕信号
gen. busy-back
占线 信号: 10 phrases in 6 subjects
Air defense1
Communications1
General1
Shipbuilding1
Technology5
Telecommunications1