Zhang Yuliang buys bottled water by scanning a QR code on train G8516 in Chongqing, southwest China, Feb, 9, 2018. Zhang Yuliang, a 25-year-old girl from Chongqing, loves to record daily life by smart phone. She took photos of the trip from Chongqing North Railway Station to Dazu South Railway Station during the Spring Festival travel rush. (Xinhua/Liu Chan)