Noun:
-
an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
- Are the ship's main radio transmitter aerials earthed and radars switched off?
船上主要的无线电发射天线是否已接地，雷达设备电源是否已断开？
- A numbers station is a government operated radio station broadcasting intermittently on the short-band frequencies.
电台是政府操作的无线电发射站，间歇地发射短波频率。
