今年6月，数千名社会活动分子，政策制定者和商界人士都将齐聚里约热内卢，参加以绿色经济为主题的第三届联合国可持续发展会议（Rio+20 ） 。
This June, thousands of activists, policymakers, and business people will converge on Rio de Janeiro for the third giant United Nations Sustainable Development Conference (Rio+20), whose theme is the green economy.