Aerial photo taken on March 22, 2020 shows the scenery of Sanjiangkou in Nanning, south China's Guangxi Zhuang Autonomous Region, March 22, 2020. (Xinhua/Lei Jiaxing)

Aerial photo taken on March 22, 2020 shows the scenery of Sanjiangkou in Nanning, south China's Guangxi Zhuang Autonomous Region, March 22, 2020. (Xinhua/Lei Jiaxing)

Aerial photo taken on March 22, 2020 shows the scenery of Sanjiangkou in Nanning, south China's Guangxi Zhuang Autonomous Region, March 22, 2020. (Xinhua/Lei Jiaxing)

Aerial photo taken on March 22, 2020 shows the scenery of Sanjiangkou in Nanning, south China's Guangxi Zhuang Autonomous Region, March 22, 2020. (Xinhua/Lei Jiaxing)

Aerial photo taken on March 22, 2020 shows the scenery of Sanjiangkou in Nanning, south China's Guangxi Zhuang Autonomous Region, March 22, 2020. (Xinhua/Lei Jiaxing)