AM radio can be sent over larger distances, but the quality of the sound is not as good as a later kind of radio signal processing, called frequency modulation.

VOA: special.2010.12.08

Now do that in a sound byte on a national radio station when you got two minutes to answer.

这时你就得为全国听众一字一句地,在两分钟时间内解答这个问题

耶鲁公开课 - 美国内战与重建课程节选

(Sound) Boillon told French radio that business potential in Iraq is enormous.

VOA: standard.2009.11.16