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| waterway net; waterway network | |||
| routeing system | |||
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航道系 统 : 33 phrases in 10 subjects |
| Air defense | 2 |
| Automobiles | 3 |
| Aviation | 5 |
| Earth sciences | 3 |
| Electronics | 3 |
| Nautical | 2 |
| Navigation | 1 |
| Space | 10 |
| Technology | 3 |
| United States | 1 |
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