Those first KDKA broadcasts led to the success of the radio industry.

那些最早的商业电台广播引领收音机产业的大获成功。

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Only four years after the first KDKA broadcast, there were six hundred radio stations in the United States. Radio stations also began to broadcast in other countries.

仅在KDKA电台首次广播的四年后，美国就有600家无线电台开播，其他国家也开播了一些广播电台。

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