The image of a character from Belgian comic "The Smurfs" is seen on a China-Belgium theme train of Shanghai Metro Line 2 in East China's Shanghai, Oct 20, 2018. The theme train was launched by Shanghai Metro on Saturday as a special service to mark the upcoming China International Import Expo. [Photo/Xinhua]

The image of a character from Belgian comic "The Smurfs" is seen on a China-Belgium theme train of Shanghai Metro Line 2 in East China's Shanghai, Oct 20, 2018. The theme train was launched by Shanghai Metro on Saturday as a special service to mark the upcoming China International Import Expo. [Photo/Xinhua]