Photo taken on May 21, 2018 shows a cross-border e-commerce freight train in Xi'an, northwest China's Shaanxi Province. The first cross-border e-commerce freight train from Hamburg of Germany arrived in Xi'an on Monday. (Xinhua/Li Yibo)

Photo taken on May 21, 2018 shows a cross-border e-commerce freight train in Xi'an, northwest China's Shaanxi Province. The first cross-border e-commerce freight train from Hamburg of Germany arrived in Xi'an on Monday. (Xinhua/Li Yibo)

Photo taken on May 21, 2018 shows a cross-border e-commerce freight train in Xi'an, northwest China's Shaanxi Province. The first cross-border e-commerce freight train from Hamburg of Germany arrived in Xi'an on Monday. (Xinhua/Li Yibo)