A worker collects ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)

Aerial photo shows workers collecting ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)

A worker collects ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)

A worker transports ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Xinhua/Cheng Zilong)

A worker loads a truck with ice in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)

Workers collect ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)

Workers load a truck with ice in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Xinhua/Cheng Zilong)

A worker collects ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)

Workers collect ice from the Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Dec. 11, 2019. Ice cubes collected from the frozen Songhua River will be used in decoration of the city. (Photo by Xie Jianfei/Xinhua)