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| 声音频30 赫 ~ 20 千赫 | |||
| 声频 (audiofrequentia) | |||
| 音频 | |||
| 声频 | |||
| 音［声］频 | |||
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audiofrequency : 19 phrases in 9 subjects |
| Automobiles | 2 |
| Aviation | 2 |
| Dermatology | 1 |
| Earth sciences | 2 |
| Electronics | 1 |
| Geophysics | 3 |
| Oil / petroleum | 1 |
| Otorhinolaryngology | 2 |
| Space | 5 |
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