Photo taken on Nov. 30, 2019 shows the snow scenery at Jiankou Great Wall in Huairou District of Beijing, capital of China. (Photo by Bu Xiangdong/Xinhua)

  Photo taken on Nov. 30, 2019 shows the snow scenery at Jiankou Great Wall in Huairou District of Beijing, capital of China. (Photo by Bu Xiangdong/Xinhua)

  Photo taken on Nov. 30, 2019 shows the snow scenery at Jiankou Great Wall in Huairou District of Beijing, capital of China. (Photo by Bu Xiangdong/Xinhua)

  Photo taken on Nov. 30, 2019 shows the snow scenery at Jiankou Great Wall in Huairou District of Beijing, capital of China. (Photo by Bu Xiangdong/Xinhua)

  Photo taken on Nov. 30, 2019 shows the snow scenery at Jiankou Great Wall in Huairou District of Beijing, capital of China. (Photo by Bu Xiangdong/Xinhua)