Cambodian King Norodom Sihamoni (2nd R) visits the site of the first national congress of the Communist Party of China (CPC) in Shanghai, east China, on March 16, 2021. Sihamoni arrived in Shanghai by plane on Monday morning. (Xinhua/Gao Feng)

Cambodian King Norodom Sihamoni (L, front) visits the Shanghai Pudong Expo in Shanghai, east China, on March 15, 2021. Sihamoni arrived in Shanghai by plane on Monday morning. (Xinhua/Gao Feng)

Cambodian King Norodom Sihamoni (1st L, front) enjoys the night view along Huangpu River by boat in Shanghai, east China, on March 15, 2021. Sihamoni arrived in Shanghai by plane on Monday morning. (Xinhua/Gao Feng)