Mobile photo shows a woman posing at the National Centre for the Performing Arts in Beijing, capital of China, Sept. 17, 2019. (Xinhua/Tang Rufeng)

Mobile photo shows the Central Television Tower in Beijing, capital of China, Aug. 29, 2019. (Xinhua/Pan Siwei)

Mobile photo shows people visiting Sanlitun business area in Beijing, capital of China, Aug. 29, 2019. (Xinhua/Zhang Yudong)

Mobile photo shows people visiting the Xidan business area in Beijing, capital of China, Aug. 16, 2019. (Xinhua/Ding Hongfa)

Mobile photo shows the interior of Beijing Daxing International Airport in Beijing, capital of China, Oct. 6, 2019. (Xinhua/Zhang Chuanqi)

Mobile photo shows the Beihai Park in Beijing, capital of China, Sept. 3, 2019. (Xinhua/Tai Sicong)

Mobile photo shows people visiting Sanlitun business area in Beijing, capital of China, Aug. 29, 2019. (Xinhua/Zhang Yudong)

Mobile photo shows the Central Television Tower in Beijing, capital of China, Sept. 1, 2019. (Xinhua/Zhang Chuanqi)

Mobile photo shows the Confucius Temple in Beijing, capital of China, Oct. 6, 2019. (Xinhua/Zhang Chuanqi)

Mobile photo shows the Palace Museum in Beijing, capital of China, March 14, 2019. (Xinhua/Fei Maohua)

Mobile photo shows the Wangfujing shopping street in Beijing, capital of China, July 25, 2019. (Xinhua/Zhu Weixi)

Mobile photo shows the Palace Museum in Beijing, capital of China, March 14, 2019. (Xinhua/Wang Yiliang)

Mobile photo shows the Bell Tower in Beijing, capital of China, Aug. 13, 2019. (Xinhua/Wang Junlu)

Mobile photo shows the Chang'an Street in Beijing, capital of China, Oct. 1, 2019. (Xinhua/Ding Jing)

Mobile photo shows the Palace Museum turret in Beijing, capital of China, Feb. 12, 2019. (Xinhua/Wang Yiliang)

Mobile photo shows the scenery in Peking University in Beijing, capital of China, Oct. 10, 2019. (Xinhua/Meng Tao)

Mobile photo shows a view of the Qianmen street in Beijing, capital of China, Feb. 26, 2019. (Xinhua/Zhao Wanwei)

Mobile photo shows the CBD in Beijing, capital of China, Aug. 15, 2019. (Xinhua/Xue Dongmei)

Mobile photo shows the Mutianyu section of Great Wall in Beijing, capital of China, April 11, 2019. (Xinhua/Wang Jianhua)

Mobile photo shows the Temple of Heaven in Beijing, capital of China, March 16, 2019. (Xinhua/Zhang Haofu)

Mobile photo shows the CBD in Beijing, capital of China, May 2, 2019. (Xinhua/Tu Ming)

Mobile photo shows the Beijing Worker's Stadium in Beijing, capital of China, Aug. 13, 2019. (Xinhua/Ma Ping)

Mobile photo shows the Mutianyu section of Great Wall in Beijing, capital of China, Aug. 25, 2019. (Xinhua/Chen Xu)

Mobile photo shows the Shuangqing Villa in Beijing, capital of China, Sept. 13, 2019. (Xinhua/Ren Chao)

Mobile photo shows people waiting at Beijing South Railway Station in Beijing, capital of China, Aug. 27, 2019. (Xinhua/Ding Hongfa)

Mobile photo shows the Beijing Railway Station in Beijing, capital of China, Sept. 26, 2019. (Xinhua/Liu Hui)

Mobile photo shows the White Pagoda of Beihai Park in Beijing, capital of China, Sept. 1, 2019. (Xinhua/Zhang Haofu)

Mobile photo shows the Mutianyu section of Great Wall in Beijing, capital of China, April 11, 2019. (Xinhua/Hou Dongtao)

Mobile photo shows a view of the Qianmen street in Beijing, capital of China, Sept. 15, 2019. (Xinhua/Zhang Chuanqi)

Mobile photo shows the Shichahai scenic area in Beijing, capital of China, March 12, 2019. (Xinhua/Ju Huanzong)

Mobile photo shows the Gubei Water Town in Beijing, capital of China, Aug. 21, 2019. (Xinhua/Meng Dingbo)

Mobile photo shows the Central Television Tower in Beijing, capital of China, Aug. 29, 2019. (Xinhua/Pan Siwei)

Mobile photo shows workers cleaning the exterior of the National Centre for the Performing Arts in Beijing, capital of China, Sept. 17, 2019. (Xinhua/Liu Hui)

Mobile photo shows the Summer Palace in Beijing, capital of China, Sept. 27, 2019. (Xinhua/Guan Guifeng)

Mobile photo shows people running the Beijing Marathon on Xueyuan Road in Beijing, capital of China, Nov. 3, 2019. (Xinhua/Ding Hongfa)

Mobile photo shows the National Stadium, or the Bird's Nest, in Beijing, capital of China, May 12, 2019. (Xinhua/Sui Xiankai)

Mobile photo shows the Beijing Fun at Qianmen in Beijing, capital of China, Nov. 2, 2019. (Xinhua/Zhang Chuanqi)

Mobile photo shows the Palace Museum in Beijing, capital of China, Oct. 6, 2019. (Xinhua/Tian Chenxu)

Mobile photo shows the Palace Museum turret in Beijing, capital of China, Feb. 12, 2019. (Xinhua/Wang Yiliang)