Photo taken on May 10, 2019 shows the construction site of the National Cross-Country Skiing Center of the 2022 Winter Olympic Games, in Zhangjiakou, north China's Hebei Province. According to an exclusive interview on Thursday with Xu Zhijun, deputy secretary of the Beijing Organizing Committee for the 2022 Olympic and Paralympic Winter Games, the preparation work is so far going smoothly in terms of many aspects such as infrastructure construction projects, as there are 1,000 days left until the 2022 Beijing Winter Olympics begins. (Xinhua/Xing Guangli)