radio aid

基本解释

Radar apparatus, radio navigational aid apparatus and radio remote control apparatus.
雷达设备、无线电导航设备及无线电遥控设备。
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Broadcasters said villagers on Alishan had crawled down the mountainside to an abandoned police station to request aid by radio.
电视主播说，阿里山上的村民攀爬下山来到一个废弃的警察局通过无线电请求援助。
A radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.
飞机上的一种无线电导航设备，通过测量电波往返飞机和预选地面（DME）台之间所需要的时间来确定两者间的距离。