A visitor scans a photo to watch first-aid videos at the big data expo in Guiyang, Southwest China's Guizhou province on May 25, 2017. (Photo/chinadaily.com.cn)
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A visitor scans a photo to watch first-aid videos at the big data expo in Guiyang, Southwest China's Guizhou province on May 25, 2017. (Photo/chinadaily.com.cn)
