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。
Senator Barack Obama also campaigned around the state and told Pittsburgh radio station KDKA that he expects a close race on Tuesday .
奥巴马参议员的竞选也围绕着这个州。他在匹兹堡KDKA电台上表示，他期待着星期二的一场势均力敌的争斗。
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