Photo taken with a mobile phone shows sunset glow in Beijing, capital of China, Sept. 16, 2021.Photo:Xinhua

Photo taken with a mobile phone shows buildings at sunset in Chaoyang District of Beijing, capital of China, June 18, 2021. Photo:Xinhua

Photo taken with a mobile phone shows people walking along the Yongding River at sunset in Daxing District of Beijing, capital of China, May 30, 2021.Photo:Xinhua

Photo taken with a mobile phone shows sunset glow in Xicheng District of Beijing, capital of China, Oct. 10, 2021. Photo:Xinhua

Photo taken with a mobile phone shows sunset glow in Beijing, capital of China, Aug. 1, 2021.Photo:Xinhua

Photo taken with a mobile phone shows a girl riding bike along the Liangshui River at sunset in Tongzhou District of Beijing, capital of China, Sept. 20, 2021.Photo:Xinhua

Photo taken with a mobile phone shows building silhouette at sunrise in Chaoyang District of Beijing, capital of China, June 18, 2021. Photo:Xinhua

Photo taken with a mobile phone shows sunset scenery in Beijing, capital of China, Aug. 1, 2021.Photo:Xinhua

Photo taken with a mobile phone shows people watching sunset in Yuyuantan Park in Beijing, capital of China, June. 17, 2021. Photo:Xinhua

Photo taken with a mobile phone shows a woman walking her dog at sunset in Xicheng District of Beijing, capital of China, Oct. 10, 2021.Photo:Xinhua