Aerial photo taken on Aug. 28, 2019 shows the cloud scenery at the Qinling Mountains in Ningshan County, northwest China's Shaanxi Province. Ningshan County is located at the foot of the Qinling Mountains. (Photos: Xinhua)

Aerial photo taken on Aug. 28, 2019 shows the cloud scenery at the Qinling Mountains in Ningshan County, northwest China's Shaanxi Province. Ningshan County is located at the foot of the Qinling Mountains.

Aerial photo taken on Aug. 28, 2019 shows the cloud scenery at the Qinling Mountains in Ningshan County, northwest China's Shaanxi Province. Ningshan County is located at the foot of the Qinling Mountains.

Aerial photo taken on Aug. 28, 2019 shows the cloud scenery at the Qinling Mountains in Ningshan County, northwest China's Shaanxi Province. Ningshan County is located at the foot of the Qinling Mountains.

Aerial photo taken on Aug. 28, 2019 shows the cloud scenery at the Qinling Mountains in Ningshan County, northwest China's Shaanxi Province. Ningshan County is located at the foot of the Qinling Mountains.