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21. | navigation constant |
| 导航常数 |
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22. | aerospace navigation |
| 航空航天导航 |
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23. | acoustic navigation |
| 音响导航 |
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24. | navigation coordinates |
| 导航坐标 |
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25. | light navigation |
| 灯光导航 |
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26. | radar navigation |
| 雷达导航 |
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27. | landmark navigation |
| 地标导航 |
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28. | navigation control station |
| 导航控制站 |
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29. | Loran navigation |
| 罗兰导航 |
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30. | navigation equipment |
| 导航设备 |
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