Photo taken on Aug. 10, 2018 shows ceiling decoration in the Thomas Jefferson Building of the U.S. Library of Congress in Washington D.C, the United States. (Xinhua/Liu Jie)

A worker is seen at a road construction site amid high temperature in Yangzhou, east China's Jiangsu Province, Aug. 8, 2018. (Xinhua/Meng Delong)

Children practice roller skating at a square in Hengdong County, central China's Hunan Province, Aug. 8, 2018, the National Fitness Day. (Xinhua/Xiao Yahui)

Aerial photo shows apricots in blossom in Turpan, northwest China's Xinjiang Uygur Autonomous Region, March 8, 2017. (Xinhua/Zhao Ge)

Silver craftsman Pan Shixue shows the pattern of a silver ornament in Leishan County, southwest China's Guizhou Province, Aug. 3, 2018. (Xinhua/Yang Wenbin)

Photo taken on Aug. 8, 2018 shows sea of clouds after a rainfall at Huangyaguan section of the Great Wall in Tianjin, north China. (Xinhua/Wang Guangshan)

People dance at a square in Wenzhou, east China's Zhejiang Province, Aug. 8, 2018, the National Fitness Day. (Xinhua/Su Qiaojiang)

Citizens practice diving on Hanjiang River in Xiangyang, central China's Hubei Province, Aug. 8, 2018, the National Fitness Day. (Xinhua/Wang Hu)

Photo taken on Aug. 9, 2018 shows the starry sky in Golan Heights. (Xinhua/Guo Yu)

A car runs on a road that divides desert and desert under control in the Hengshan District of Yulin City, northwest China's Shaanxi Province, Aug. 4, 2018. (Xinhua/Tao Ming)