Their competition and collaboration were creating the broadcasting industry in the United States, beginning with the introduction of commercial radio programming in the early 1920s.

从20世纪20年代早期引入商业广播节目开始，这些竞争与合作就在开创美国的广播产业。

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The world of news and information industry is undergoing huge changes, so we need to realize how they influence our mass media, including news agencies, TV channels and radio broadcasting.

今天，新闻信息产业界正在经历巨变，我们必须认识到这些变化对大众传媒的影响有多大，无论是通讯社，还是电视台或印刷媒体及广播，都笼罩在其影响之下。

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