Staff members at a monitor center show how the drone defense system works Guangzhou Baiyun International Airport, Nov. 23, 2017. (Photo: China News Service/Guo Jun). (ECNS) — A detection and defense system against unmanned aerial vehicles has been put into trail operation at Guangzhou … China News 1511446834 5,2013:googlealerts/feed:15051106563928821243

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