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回 声 测探 : 57 phrases in 21 subjects |
| Acoustics | 1 |
| Agriculture | 1 |
| Air defense | 1 |
| Architecture | 3 |
| Aviation | 2 |
| Construction | 2 |
| Earth sciences | 1 |
| Electronics | 6 |
| Engineering geology | 3 |
| Exhibitions | 2 |
| Fish farming pisciculture | 1 |
| Fishery fishing industry | 3 |
| General | 5 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Mining | 1 |
| Oil / petroleum | 6 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 13 |
| Telecommunications | 1 |
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