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| sonic echo exploration | |||
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| 水声探测: 19 phrases in 8 subjects |
| Aviation | 1 |
| Electronics | 1 |
| General | 4 |
| Metallurgy | 1 |
| Nautical | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 8 |
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