airwaves

n.medium for radio and television broadcasting

"the president used the airwaves to take his message to the people"

同义词：air

1. The new radio station has finally hit the airwaves after months of preparation.
   这家新电台经过几个月的准备后终于在空气波段上开播了。
2. Politicians often use the airwaves to communicate their messages to the public.
   政治家们经常利用广播频率向公众传达他们的信息。