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| audio system; sonic frequency system | |||
| 音频系统: 46 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 6 |
| Earth sciences | 1 |
| Electronics | 22 |
| Exhibitions | 1 |
| General | 1 |
| Geophysics | 1 |
| Information technology | 4 |
| Oil / petroleum | 2 |
| Otorhinolaryngology | 1 |
| Space | 3 |
| Technology | 3 |
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