Saskia Sassen, a professor from Columbia University who proposed the term "global city", attends the a symposium on Shanghai's development from May 24 to 25. [Photo/wrsa.net]

Wu Zhiqiang, academician of Chinese Academy of Engineering and vice-president of Tongji University, delivers a speech at a symposium on Shanghai's development. [Photo/wrsa.net]

Otan Herzog, academician of the German Academy of Science and Engineering, speaks at a symposium on Shanghai's development. [Photo/wrsa.net]