间接宣传；间接无线电传送。
Black propaganda; black radio transmissions.
youdao
紧急消息是今晚用无线电传送给我们的。
An urgent message was radioed to us this evening.
一种向飞机发送特殊导航信号的无线电传送装置。
A radio transmitter that emits a characteristic guidance signal for aircraft.
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