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| 航空术; 空中导航领航学 | |||
| 领航; 导航; 领航学 | |||
| 航空空中导航 | |||
| 空中导航; 航空学 | |||
| 空中领航; 航空术 | |||
| avigation: 2 phrases in 2 subjects |
| Technology | 1 |
| Telecommunications | 1 |
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