Photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region. (Photos: Xinhua)

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Photo taken on Jan. 24, 2021 shows an icefall on the Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a bird perching on a snow-covered tree branch by the Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.

Aerial photo taken on Jan. 24, 2021 shows a view of the snow-covered Cheshi Ancient Trail, a shortcut through the Tianshan Mountains that historically linked trade routes along the Silk Road, in northwest China's Xinjiang Uygur Autonomous Region.