Tourists visit a forest park in Guiyang, southwest China's Guizhou Province, July 5, 2018. (Xinhua/Tao Liang)

Aerial photo taken on July 3, 2018 shows a park in Guiyang city, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Tourists visit Huaxi wetland park in Guiyang, southwest China's Guizhou Province, July 4, 2018. (Xinhua/Lu Peng)

Tourists visit Huaxi wetland park in Guiyang, southwest China's Guizhou Province, July 4, 2018. (Xinhua/Lu Peng)

Tourists visit a forest park in Guiyang, southwest China's Guizhou Province, July 5, 2018. (Xinhua/Tao Liang)

Tourists visit Aha lake wetland park in Guiyang, southwest China's Guizhou Province, July 5, 2018. (Xinhua/Ou Dongqu)

Tourists visit Huaxi wetland park in Guiyang, southwest China's Guizhou Province, July 5, 2018. (Xinhua/Ou Dongqu)

Tourists visit Aha lake wetland park in Guiyang, southwest China's Guizhou Province, July 5, 2018. (Xinhua/Ou Dongqu)

Tourists visit Aha lake wetland park in Guiyang, southwest China's Guizhou Province, July 5, 2018. (Xinhua/Lu Peng)