- 双: two; twin; both; dual
- 航路: air or sea route; route; tra ...
- 无线电导航: radio navigation
- 四航路无线电导航台: four-course radio range
- 无线电导航: maritime radio navigation; navigation radio; radio aid to navigation; radio aids; radio air navigation; radio guidance; radio navigation guidance; radio navigation=radionavigation; rn radio navigation
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