A tourist takes photos at a park in Jinan, east China's Shandong Province, May 10, 2019. (Xinhua/Zhang Chunfeng)

Aerial photo taken on May 11, 2019 shows tourists viewing the Hongyegu scenic spot in Jinan, east China's Shandong Province. (Xinhua/Li Xinjun)

Aerial photo taken on May 11, 2019 shows a wetland along the Shangzhong River in Jinan, east China's Shandong Province. (Xinhua/Gao Qimin)

Aerial photo taken on May 11, 2019 shows tourists viewing the Hongyegu scenic spot in Jinan, east China's Shandong Province. (Xinhua/Wu Jiquan)

Photo taken on May 10, 2019 shows a bird standing along the Daming Lake in Jinan, east China's Shandong Province. (Xinhua/Sun Zhongzhe)

Photo taken on May 10, 2019 shows a light show in the Daming Lake scenic spot in Jinan, east China's Shandong Province. (Xinhua/Xu Wenhao)

Tourists view the Daming Lake scenic spot in Jinan, east China's Shandong Province, May 9, 2019. (Xinhua/Wang Peike)

Photo taken on May 11, 2019 shows Quancheng square in Jinan City, east China's Shandong Province. (Xinhua/Gao Qimin)