Tourists take selfies at the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday. (Photos: Xinhua)

Tourists play at the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

Aerial photo shows a view of the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

A tourist plays at the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

A tourist takes photos at the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

A tourist takes photos at the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

Aerial photo shows a view of the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

Tourists play at the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

Aerial photo shows a view of the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.

Aerial photo shows a view of the Harbin Ice-Snow World in Harbin, northeast China's Heilongjiang Province, Dec. 24, 2020. The 22nd Harbin Ice-Snow World opened to the public on Thursday.