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| observation ship | |||
| oceanographic research ship | |||
| oceanographic research vessel | |||
| oceanographic research vessel | |||
| ocean investigation ship; oceanographic research ship; oceanographical research ship | |||
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| oceanographic research ship | |||
| 海洋 调 查船: 19 phrases in 4 subjects |
| Nautical | 6 |
| Oil / petroleum | 3 |
| Shipbuilding | 3 |
| Technology | 7 |
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