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12306.cn, China's official website for purchasing railway tickets, has become the largest of this kind in the world, with combined sales reaching 3.5 billion in 2017. 我国火车票购票官网12306网站已成为世界最大火车票购票网站，2017年该网站交易总量达35亿张车票。 "If all these train tickets were lined up, they would circle the earth 7 times," said Zhu Jiansheng, deputy director of the Institute of Computing Technologies with the Chinese Academy of Railway Sciences, where the ticketing system was developed. 该车票系统由中国铁道科学研究院电子计算技术研究所研发。该研究所副所长朱建生称：“如果所有这些车票排列起来，可以绕地球7圈。” | 
