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世界主要航线
| 区
| 世界主要航线 | |
| avia. | major world air routes |
| 0区 | |
| el. sec.sys. | zone 0 |
| 1区 | |
| el. sec.sys. | zone 1 |
| 20区 | |
| el. sec.sys. | zone 20 |
| 21区 | |
| el. sec.sys. | zone 21 |
| 22区 | |
| el. sec.sys. | zone 22 |
| 2区 | |
| el. sec.sys. | zone 2 |
| 区 | |
| gen. | district |
| wind. | band |
| G-P区 | |
| met. | G-P cluster |
| |||
| major world air routes | |||
|
世界主要航线 : 3 phrases in 2 subjects |
| Aviation | 2 |
| General | 1 |
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