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| 潜水艇探测; 海底探测 | |||
| 潜艇探测 | |||
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submarine detection : 13 phrases in 6 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Mechanics | 1 |
| Navigation | 1 |
| Space | 1 |
| Technology | 6 |
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