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Visitors pay bills by scanning the QR code at the Fourth China Tibet Tourism and Culture Expo in Lhasa, capital of southwest China's Tibet Autonomous Region, Sept. 10, 2018. (Xinhua/Liu Dongjun)
Visitors pay bills by scanning the QR code at the Fourth China Tibet Tourism and Culture Expo in Lhasa, capital of southwest China's Tibet Autonomous Region, Sept. 10, 2018. (Xinhua/Liu Dongjun)