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Beijing is home to 520 kilometers of the Great Wall, which traverses 15 provinces and cities.

Before departing, Liu Huimin, 79, said: "I am looking forward to the longest trip by train. In recent years, I have chosen Sanya to spend the winter with my wife. In the past, we had to travel by plane, which is not comfortable at all for seniors. The rhythm of the tourist train suits us better. We can gradually adapt to the great change of climate from cold to warm, which can prevent health problems.

Before 2018, there were few study lounges in China, and that too mainly in some first-and second-tier cities such as Guangzhou, Suzhou and Tianjin. In Beijing, the first study lounge opened in 2018. Yet by 2019, study lounges had become popular nationwide thanks to the wave of sharing economy.

Before the latest purchase, Qatar Airways owned 4.9 percent of China Southern's issued share capital.

Before the app was introduced, only smart phones with NFC chips could pay this way.