Practice for the real world: From Aug 2 to 5, the 4th China Daily 21st Century Model United Nations Conference was held in Suzhou, Jiangsu. More than 600 teenagers gathered by Taihu Lake for the event. They acted as representatives (代表) of countries to solve real-world problems in areas such as global warming, inequality (不平等), internet safety and clean energy (清洁能源).  21ST CENTURY