A staff member does the cleaning at the main venue of the Boao Forum for Asia (BFA) annual conference in Boao, south China's Hainan Province, on April 17, 2021. The BFA's annual conference, themed on "A World in Change: Join Hands to Strengthen Global Governance and Advance Belt and Road Cooperation" this year, is scheduled for April 18 to 21 in Boao. (Xinhua/Yang Guanyu)
