名词
中文翻译：应答器
同义词：
['responder', 'transponder', 'receiver']
例句：
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1. The GPS system usesa series of radio waves to communicate withthe GPS satellites.
全球定位系统使用一系列无线电波与全球定位卫星通信。
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2. The device is designed to receive signalsfrom the satellite and relay them back tothe ground station.
该设备设计用来接收来自卫星的信号，并将它们转发回地面站。
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3. The GPS receiver can beused to track the location of a vehicleon a map.
GPS接收器可以用来在地图上追踪车辆的位置。