Aerial photo taken on April 23, 2020 shows a view of Gengwang Lake in Long'an County, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Zhou Hua)

Aerial photo taken on April 23, 2020 shows people exercising at a small park in Jimo District of Qingdao, east China's Shandong Province. Local authority of Jimo District in Qingdao has built a batch of small parks with each covering 2,000 to 10,000 square meters, an effort to offer space of leisure activities for residents. (Photo by Liang Xiaopeng/Xinhua)

People exercise at a small park in Jimo District of Qingdao, east China's Shandong Province, April 22, 2020. Local authority of Jimo District in Qingdao has built a batch of small parks with each covering 2,000 to 10,000 square meters, an effort to offer space of leisure activities for residents. (Photo by Liang Xiaopeng/Xinhua)

Aerial photo taken on April 23, 2020 shows people walking at a small park in Jimo District of Qingdao, east China's Shandong Province. Local authority of Jimo District in Qingdao has built a batch of small parks with each covering 2,000 to 10,000 square meters, an effort to offer space of leisure activities for residents. (Photo by Liang Xiaopeng/Xinhua)

Aerial photo taken on April 23, 2020 shows a view of the Gubei Water Town in Beijing, capital of China. (Xinhua/Zhang Chenlin)

Aerial photo taken on April 23, 2020 shows a night view of the Gubei Water Town in Beijing, capital of China. (Xinhua/Zhang Chenlin)