Aerial photo taken on Feb. 24, 2021 shows the scenery of Ahahu national wetland park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on Feb. 24, 2021 shows the scenery of Ahahu national wetland park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Citizens do physical exercise at Guanshanhu Park in Guiyang City, southwest China's Guizhou Province, July 7, 2021. (Xinhua/Yang Wenbin)

Aerial photo taken on Feb. 24, 2021 shows the scenery of Ahahu national wetland park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on July 7, 2021 shows the scenery of Guanshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)

Aerial photo taken on July 10, 2021 shows the scenery of Yueshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Liu Xu)

Aerial photo taken on July 7, 2021 shows citizens walking at Guanshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)

Aerial photo taken on July 7, 2021 shows citizens walking at Guanshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)

Aerial photo taken on July 7, 2021 shows the scenery of Guanshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)

Aerial photo taken on July 10, 2021 shows the scenery of Yueshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Liu Xu)

Aerial photo taken on July 10, 2021 shows the scenery of Yueshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Liu Xu)

Aerial photo taken on July 7, 2021 shows the scenery of Guanshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)

Aerial photo taken on Feb. 24, 2021 shows the scenery of Ahahu national wetland park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on July 10, 2021 shows the scenery of Yueshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Liu Xu)

Aerial photo taken on Feb. 24, 2021 shows the scenery of Ahahu national wetland park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on July 7, 2021 shows the scenery of Guanshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)

Aerial photo taken on July 10, 2021 shows the scenery of Yueshanhu Park in Guiyang City, southwest China's Guizhou Province. (Xinhua/Liu Xu)