A Hong Kong youth delegation to the Chinese mainland is launched in Shenzhen, south China's Guangdong Province, June 25, 2018. Organized by the Committee of Youth Activities in Hong Kong, a delegation of some 150 Hong Kong youths on Monday went on a five-day tour to Shenzhen, Wuhan and Beijing to learn about the reform and opening up in the Chinese mainland. (Xinhua/Mao Siqian)