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。
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.
有人说，当商业广播出现时，马可尼失去了优势，他认为收音机不可以也不应该用于无聊的目的。
There are some who say Marconi lost his edge when commercial broadcasting came along; he didn't see that radio could or should be used to frivolous ends.
一家商业广播电台质疑道。
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