If you hook a radio wave up with a radio, you can tell the radio wave was there because what the radio is doing?

如果你用收音机检测无线电波，你可以知道无线电波在那,因为收音机在干什么？

耶鲁公开课 - 死亡课程节选

I do do radio actually with WKCR which is the student-run organization and is broadcast on 89.9 FM.

我是WKCR的播音员。WKCR是一个学生组织，我们的广播频道是89.9FM。

广播人员怎么样？ - SpeakingMax英语口语达人