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churr | |||
alternating current hum | |||
hum | |||
ripple | |||
backdrop | |||
back drop; hum noise | |||
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hum |
交流声 : 57 phrases in 11 subjects |
Air defense | 5 |
Electric machinery | 2 |
Electronics | 7 |
General | 5 |
Information technology | 1 |
Nautical | 1 |
Oil / petroleum | 3 |
Shipbuilding | 8 |
Space | 3 |
Technology | 19 |
Telecommunications | 3 |