Youth representatives from Hong Kong and their peers from Shenzhen take part in an exchange activity 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)