求翻译：1．The ballroom on the third floor of San Francisco's Moscone West convention center doesn't look like anything special. But in recent years this nondescript hall has become the source of major news about smart phones, tablets and other cutting-edge mobile gizmos. Apple and Google use it for the keynote addresses that are the signature events of their developer conferences. As the two most significant companies in the mobile-software business, they're doing much of the heavy lifting in determining where the industry is going, and the rivalry between Apple's iOS and Google's Android is as fierce as any tech face-off I can recall.是什么意思？

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