short wave
noun(also shortwave)
[countable, uncountable] (abbreviation SW)
a radio wave with a length of between 10 and 100 metres; the band of radio waves of this length used for broadcasting （无线电）短波 a short-wave radio/transmitter 短波收音机/发射机 - on short wave
The BBC also broadcasts on short wave. BBC也用短波广播。