Zheng Zhongwei, head of the working group for vaccine development under the State Council joint prevention and control mechanism against COVID-19, speaks at a sub-forum of Boao Forum for Asia annual conference in Boao, south China's Hainan Province, April 20, 2021. A sub-forum themed "CEO Roundtable - Supply and Accessibility of COVID-19 Vaccines" was held in Boao on Tuesday. (Xinhua/Li He)
