询问--应答系统，顾名思义，是为用户提供从计算机提取信息的功能。
Enquiry-response systems provide, as the term suggests, the facility for a user to extract information from a computer .
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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