... real-time traffic 实时业务量 reanswer signal 二次应答信号 rear link 后方通信线路 ...
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二次雷达是现代航空交通管制系统中的重要组成部分，它是通过对询问 信号应答而发现目标的雷达。
Secondary radar is an important equipment in modern air traffic control system, it identify the target by interrogator sending a inquiry toward the aircraft and the aircraft responsing in the air.
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