Photo taken on April 12, 2022 shows the construction site at Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)

　　A worker is seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Xie Jianfei)

　　Workers are seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)

　　A worker is seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Xie Jianfei)

　　A staff member works at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Xie Jianfei)

　　A worker is seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Xie Jianfei)

　　A worker is seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)

　　A worker is seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)

　　Aerial photo taken on April 12, 2022 shows the construction site of a metro line in Harbin, northeast China's Heilongjiang Province. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)

　　A worker is seen at the construction site of a metro line in Harbin, northeast China's Heilongjiang Province, April 12, 2022. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Xie Jianfei)

　　Aerial photo taken on April 12, 2022 shows the construction site at Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)

　　Aerial photo taken on April 12, 2022 shows the construction site at Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province. More than 1,900 key projects have been put into construction recently in Heilongjiang Province. (Xinhua/Wang Jianwei)