People walk in snow on a street in Lhasa, capital of southwest China's Tibet Autonomous Region, Dec. 3, 2015. The city embraced the first snowfall in this winter on Thursday. (Xinhua/Purbu Zhaxi)

The Potala Palace is seen surrounded by snow-covered mountains in Lhasa, capital of southwest China's Tibet Autonomous Region, Dec. 3, 2015. The city embraced the first snowfall in this winter on Thursday. (Xinhua/Purbu Zhaxi)

Bar-headed geese fly in the sky after snowfall in Lhasa, capital of southwest China's Tibet Autonomous Region, Dec. 3, 2015. The city embraced the first snowfall in this winter on Thursday. (Xinhua/Purbu Zhaxi)