Photo taken on May 21, 2019 shows the Elbphilharmonie concert hall on the riverside of Elbe River in the harbor of Hamburg, Germany. Hamburg, Europe's second largest port and also one of the important slots of China Railway Express (CRE), has played a significant role in the Belt and Road Initiative over the past few years. (Xinhua/Shan Yuqi)

Photo taken on May 21, 2019 shows a view of the port area of Hamburg, Germany, on May 21, 2019. Hamburg, Europe's second largest port and also one of the important slots of China Railway Express (CRE), has played a significant role in the Belt and Road Initiative over the past few years. (Xinhua/Shan Yuqi)

Photo taken on May 21, 2019 shows a sailboat anchored at the port area of Hamburg, Germany, on May 21, 2019. Hamburg, Europe's second largest port and also one of the important slots of China Railway Express (CRE), has played a significant role in the Belt and Road Initiative over the past few years. (Xinhua/Shan Yuqi)

Photo taken on May 21, 2019 shows a view of the port area of Hamburg, Germany, on May 21, 2019. Hamburg, Europe's second largest port and also one of the important slots of China Railway Express (CRE), has played a significant role in the Belt and Road Initiative over the past few years. (Xinhua/Shan Yuqi)

Photo taken on May 21, 2019 shows a ship anchored at the port area of Hamburg, Germany, on May 21, 2019. Hamburg, Europe's second largest port and also one of the important slots of China Railway Express (CRE), has played a significant role in the Belt and Road Initiative over the past few years. (Xinhua/Shan Yuqi)