Aerial photo taken on April 14, 2019 shows the view of the Daming Lake scenic spot in Jinan, East China's Shandong Province. [Photo by Wang Kai/Xinhua]

Aerial photo taken on April 14, 2019 shows the view of the Daming Lake scenic spot in Jinan, East China's Shandong Province. [Photo by Wang Kai/Xinhua]

Tourists enjoy themselves at the Daming Lake scenic spot in Jinan, east China's Shandong Province, April 14, 2019. [Photo by Wang Kai/Xinhua]

Aerial photo taken on April 14, 2019 shows the view of the Daming Lake scenic spot in Jinan, East China's Shandong Province.[Photo by Wang Kai/Xinhua]

A tourist visits the Daming Lake scenic spot in Jinan, east China's Shandong Province, April 14, 2019. [Photo by Wang Kai/Xinhua]