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音量控制: 31 phrases in 13 subjects |
Audio electronics | 1 |
Automobiles | 6 |
Aviation | 3 |
Business | 1 |
Construction | 1 |
Electronics | 4 |
Geophysics | 2 |
Information technology | 3 |
Metallurgy | 1 |
Radio | 3 |
Shipbuilding | 1 |
Technology | 4 |
Telecommunications | 1 |