Quality tracing system introduced in E China

Wang Kai, a staff member of a cooperative, attaches QR code for quality tracing to cucumbers which are going to be sold in Gaoqing County, east China's Shandong Province, Dec. 6, 2017. Quality tracing system was introduced to Gaoqing County with vegetable having its own QR code which contains basic information for customers to scan.(Xinhua/Zhu Zheng)