Aerial photo taken on Sept. 11, 2019 shows a view of the Taizicheng Interchange of Yanchong Expressway under construction in Chongli District of Zhangjiakou, north China's Hebei Province. The main part of Yanchong expressway linking Yanqing district of Beijing and Chongli district of Zhangjiakou, two competition zones of 2022 Beijing Winter Olympic Games, is expected to be completed and open this year. (Xinhua/Yang Shiyao)

　　Aerial photo taken on Sept. 11, 2019 shows a view of the Taizicheng Interchange of Yanchong Expressway under construction in Chongli District of Zhangjiakou, north China's Hebei Province. The main part of Yanchong expressway linking Yanqing district of Beijing and Chongli district of Zhangjiakou, two competition zones of 2022 Beijing Winter Olympic Games, is expected to be completed and open this year. (Xinhua/Yang Shiyao)

　　Aerial photo taken on Sept. 11, 2019 shows a view of the Taizicheng Interchange of Yanchong Expressway under construction in Chongli District of Zhangjiakou, north China's Hebei Province. The main part of Yanchong expressway linking Yanqing district of Beijing and Chongli district of Zhangjiakou, two competition zones of 2022 Beijing Winter Olympic Games, is expected to be completed and open this year. (Xinhua/Yang Shiyao)

　　Aerial photo taken on Sept. 11, 2019 shows a view of the Taizicheng Interchange of Yanchong Expressway under construction in Chongli District of Zhangjiakou, north China's Hebei Province. The main part of Yanchong expressway linking Yanqing district of Beijing and Chongli district of Zhangjiakou, two competition zones of 2022 Beijing Winter Olympic Games, is expected to be completed and open this year. (Xinhua/Yang Shiyao)