Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on Nov. 24, 2019 shows a winter view of Yixian County shrouded in the morning mist in east China's Anhui Province. (Xinhua/Zhang Duan)