Students from Princeton University attend the opening ceremony of an immersion program for international students to learn about Peking Opera and Chinese aesthetics in Shanghai, east China, Aug. 20, 2018. (Xinhua/Liu Ying)

A student from Princeton University makes self-introduction at the opening ceremony of an immersion program for international students to learn about Peking Opera and Chinese aesthetics in Shanghai, east China, Aug. 20, 2018. (Xinhua/Liu Ying)