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回声 测声器 : 32 phrases in 13 subjects |
| Agriculture | 2 |
| Air defense | 1 |
| Earth sciences | 2 |
| Electronics | 1 |
| Fishery fishing industry | 1 |
| General | 3 |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Physical sciences | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 14 |
| Telecommunications | 1 |
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