Photo taken with a mobile phone shows people walking at Xuanwuyiyuan Garden in Beijing, capital of China, July 31, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows people exercising at Xuanwuyiyuan Garden in Beijing, capital of China, July 31, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows pharmacists preparing Chinese herbal medicine at a Chinese medicine store in Beijing, capital of China, July 31, 2019.(Photo: Xinhua)

Photo taken with a mobile phone shows people enjoying themselves at Xuanwuyiyuan Garden in Beijing, capital of China, July 31, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows a pharmacist weighing Chinese herbal medicine at a Chinese medicine store in Beijing, capital of China, July 31, 2019. (Photo: Xinhua)