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| hydrographic sounding; hydrographic survey | |||
| channel survey; hydrographic survey of channel; hydrographical survey of channel; passage survey; waterway survey | |||
| 航道 测量: 16 phrases in 7 subjects |
| Earth sciences | 2 |
| General | 2 |
| Nautical | 1 |
| Navigation | 1 |
| Shipbuilding | 3 |
| Space | 2 |
| Technology | 5 |
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