同义词
1)radar (radio detecting and ranging),雷达(无线电定向和测距)2)radio detection and ranging (radar),无线电定向与测距(雷达)3)radio direction and ranging,无线电定向和测距4)optical directional and ranging(OPDAR),光学定向和测距，光雷达5)OPDAR (Optical Direction And Ranging),光学定向和测距;光雷达6)radio detection and ranging,无线电探测与测距雷达
