Residents holding umbrellas walk in the shade of trees in the heat-hit Nanjing, capital city of east China's Jiangsu Province, July 22, 2016. Photo: Xinhua

Residents enjoy cool water in Wulongtan Park in Jinan, capital city of east China's Shandong Province, July 22, 2016. As temperature rose, people choose their own ways to cool themselves. Photo: Xinhua

Residents enjoy cool water in Wulongtan Park in Jinan, capital city of east China's Shandong Province, July 22, 2016. As temperature rose, people choose their own ways to cool themselves. Photo: Xinhua

A woman wearing a sunbonnet rides an electric bike in the Jinshui District in Zhengzhou, capital city of central China's Henan Province, July 22, 2016. Heat hit Zhengzhou Friday as many places had temperatures over 37 degrees Celsius. Photo: Xinhua