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

The Chinatown Friendship Gate is pictured 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)