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操作方式；工作方式
起飞操作
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?起飞
... takeoff monitoring system 起飞监控系统 takeoff operation 起飞 takeoff order 起飞命令 ...
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
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。