Aerial Photo taken on Dec. 3, 2020 shows scenery of Hailang River in Mudanjiang City, northeast China's Heilongjiang Province. (Photo by Zhang Chunxiang/Xinhua)

Aerial Photo taken on Dec. 6, 2020 shows scenery of Hailang River in Mudanjiang City, northeast China's Heilongjiang Province. (Photo by Zhang Chunxiang/Xinhua)

Aerial Photo taken on Dec. 6, 2020 shows scenery of Hailang River in Mudanjiang City, northeast China's Heilongjiang Province. (Photo by Zhang Chunxiang/Xinhua)

Aerial Photo taken on Dec. 6, 2020 shows scenery of Hailang River in Mudanjiang City, northeast China's Heilongjiang Province. (Photo by Zhang Chunxiang/Xinhua)