In this April 29, 2015, file photo, visitors use a laptop computer at a display booth as a security guard stands nearby at the Global Mobile Internet Conference in Beijing. (AP Photo/Mark Schiefelbein, File)
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In this April 29, 2015, file photo, visitors use a laptop computer at a display booth as a security guard stands nearby at the Global Mobile Internet Conference in Beijing. (AP Photo/Mark Schiefelbein, File)
