... takeoff monitoring system 起飞监控系统 takeoff operation 起飞 takeoff order 起飞命令 ...
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takeoff operation
起飞操作
以上为机器翻译结果，长、整句建议使用 人工翻译 。
All of the towers on the list have fewer than 150, 000 operations (an operation is a takeoff or landing) or 10, 000 commercial operations a year.
CNN: Airports can make case to keep their control towers open
The FAA targeted airfields with fewer than 150, 000 operations -- an operation is a takeoff or landing -- or 10, 000 commercial operations in a year.
CNN: FAA begins process to close 168 towers on April 1
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