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| submerged operation | |||
| underwater operation | |||
| underwater work | |||
| subsea operation; underwater works | |||
| 水 下 作业: 15 phrases in 6 subjects |
| Aviation | 1 |
| Earth sciences | 3 |
| Electronics | 1 |
| Nautical | 1 |
| Navigation | 2 |
| Technology | 7 |
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