nondirectional beacon light 全方向信号灯
NDB Nondirectional Radio Beacon 无方向信标
nondirectional radio-beacon 全向无线电指向标
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A radio beacon which transmits nondirectional signals whereby the pilot can use the ADF to determine his bearing to or from the station.
发射无方向信号的无线电信标台。据此飞行员能够用自动定向仪 （ADF ）确定他的背台或向台方位。
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