A border security officer shows how to use the self-service printing machine. (Wei Wenheng/for chinadaily.com.cn)
In 2017, a total of 598 million trips were made by people entering or leaving China's borders, with 7.3 percent of them, or 43.75 million trips, coming from Shanghai's airports and sea ports.
Up to 35.6 million trips were made by people leaving and entering China via Shanghai Pudong International Airport, the largest among all airports in the nation.
