Photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake at dawn in southwest China's Tibet Autonomous Region. (Photos: Xinhua)

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Cellphone photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake at dawn in southwest China's Tibet Autonomous Region.

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake at dawn in southwest China's Tibet Autonomous Region.

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.

Aerial photo taken on Jan. 29, 2021 shows the winter scenery of Nam Co Lake in southwest China's Tibet Autonomous Region.