- spare
- 备份: back-up
- 飞机: airplane; plane; aeroplane; ...
- 备份飞行计划: antiaircraft artillery firepiston
- 备份: [计算机] back-up◇备份发射机 stand-by transmitter; 备份技术 redundancy technique; 备份记录 duplicate record
- 提交一份飞行计划: to submit an application for permission to land
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