Short-wave radio uses the 20-50 metre band.

短波收音机用的波段是20–50米。

《牛津词典》

Using data from RAJAR, a ratings agency, Enders Analysis calculates that the average 15- to 24-year-old radio listener tunes in for almost 20% fewer minutes now than five years ago.

然而来自RAJAR（评级机构）出具的恩德斯调查报告显示，年龄段在15到24岁听众收听广播的平均时间比五年前下降了几乎20%。

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Forty percent of small businesses surveyed say they now leverage Facebook as their sole marketing channel, followed by newspapers (21%), the yellow pages (20%) and local radio (7.5%).

被调查的小型企业中有40%表示他们如今使用Facebook作为唯一的营销渠道，随后是报纸(21%)，黄页(20%)和当地广播电台(7.5%)。

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(Speaking) One irate man told French radio he did not understand why Lyon airport authorities did not open at least one runway, closed by a 20-centimeter snowfall.

VOA: standard.2010.01.10

Worse still,after about 20 minutes after the ship takes off, all radio contact between ship and earth will be destroyed.

更坏的是，当飞船起飞20分钟后，所有飞船与地球的无线电通讯都被切断。

耶鲁公开课 - 死亡课程节选

People spend 80% of their listening on radio, 20% on demand.

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Overall, DAB radio accounted for 20% of all listening, up from 18% during the same period in 2011.

BBC: Record ratings for digital radio stations

It's well worth a listen on Radio 4 at 20.30 on Thursday.

BBC: The bottom line on being messy