1. The aircraft pilots picked up signals from a radio beacon. 
   飞机驾驶员听到了无线电航空信标的信号。
2. VHF omnidirectional range and tactical air navigation —VORTAC 
   伏尔塔克导航系统
3. Araneidae; orb-weaver, garden spider 
   园蛛科
4. A sphere emblematic of sovereignty; an orb. 
   小金球象征君权的金球；球
5. an omnidirectional antenna tuned to the broadcast frequencies assigned to television. 
   能够接受电视传播频率的全方位天线。

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• 1. 全向无线电信标
  omnidirectional radiator 全方位辐射器...omnidirectional radio beacon (orb) 全向无线电信标...omnidirectional radio range 全向无线电信标
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