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| 历史航迹; 逆程; 回扫描; 尾迹 | |||
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back trace : 14 phrases in 8 subjects |
| Aviation | 1 |
| Economy | 2 |
| Food industry | 4 |
| General | 1 |
| Horticulture | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 2 |
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