Photo taken on July 17, 2018 shows the scenery at Lijinghu park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on July 13, 2018 shows the scenery at Yuehai park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on June 12, 2018 shows the scenery at Baohu park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on July 15, 2018 shows the scenery at Mingcuihu wetland park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on July 12, 2018 shows the scenery at Yuehai park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on July 12, 2018 shows the scenery at Yuehai park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on June 6, 2014 shows the scenery at Baohu park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on June 12, 2018 shows the scenery at Haibao park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on July 12, 2018 shows the scenery at Yuehai park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)

Photo taken on July 12, 2018 shows the scenery at Yuehai park in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. (Xinhua/Wang Peng)