radio aid

基本解釋

Radar apparatus, radio navigational aid apparatus and radio remote control apparatus.
雷達設備、無線電導航設備及無線電遙控設備。
www.china-customs.com
Broadcasters said villagers on Alishan had crawled down the mountainside to an abandoned police station to request aid by radio.
電眡主播說，阿裡山上的村民攀爬下山來到一個廢棄的警察侷通過無線電請求援助。
A radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.
飛機上的一種無線電導航設備，通過測量電波往返飛機和預選地麪（DME）臺之間所需要的時間來確定兩者間的距離。