1000-day countdown celebrations of Beijing 2022 Olympic Winter Games held in Zhangjiakou City, N China's Hebei

Volunteers sign on the board of signatures during the 1000-day countdown celebrations of the Beijing 2022 Olympic Winter Games held in Chongli of Zhangjiakou City, north China's Hebei Province, May 11, 2019. (Xinhua/Yang Shiyao)