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。”

Since its launch in 2010, the 12306 ticketing system has been upgraded many times to fix bugs and provide better service during the Spring Festival travel rush, or Chunyun.
自从2010年开通运营以来，12306票务系统已多次升级以修复漏洞，并在春运期间提供更好的服务。

The system sold around 1.1 million tickets during the 2012 Spring Festival travel rush. Last year it sold 11 million over the same period.
2012年春运期间，12306网站系统约售出110万张车票。去年，该系统售出的车票数量同比增加1100万张。

Around 280 million train tickets have been sold on 12306.cn since Jan 3, 2018 when tickets for the Spring Festival holiday started selling.
今年1月3日春节假期车票开售以来，约有2.8亿张火车票是在12306网站上售出的。

The sales volume peaks at around 15 million per day, with nearly 700 tickets sold in every second.
销量高峰每日售票量约1500万张，每秒售出近700张车票。