Volunteers take classes on first aid in Shanghai, east China, Oct 11, 2019. A total of 5,720 volunteers have been recruited for the expo, said authorities responsible for the CIIE volunteer work at the Shanghai Committee of Chinese Communist Youth League. The training, which will focus on basic knowledge of the expo, business and commerce, medical assistance, garbage sorting and cultural differences, will last until late October. (Xinhua/Liu Ying)