Feature: 40 years on, "sisterhood" between Tianjin, Philadelphia stands ever stronger

Nancy Gilboy, former head of the Citizen Diplomacy International (CDI), is pictured during an interview with Xinhua in Philadelphia, the United States, March 13, 2019. The amazing similarities in port, science and cultural diversity have helped fostering 40 years of sisterhood between the Chinese coastal city of Tianjin and the U.S. eastern city of Philadelphia. (Xinhua/Li Muzi)