Tourists have fun in an indoor ice and snow theme park at Harbin Ice and Snow World in Harbin, known as China's "ice city" in northeast China's Heilongjiang Province. (People's Daily Online/Su Jinggang)

A tourist enjoys sliding down an ice-made slide in an indoor ice and snow theme park at Harbin Ice and Snow World in Harbin, known as China's "ice city" in northeast China's Heilongjiang Province. (People's Daily Online/Su Jinggang)

Tourists have fun in an indoor ice and snow theme park at Harbin Ice and Snow World in Harbin, known as China's "ice city" in northeast China's Heilongjiang Province. (People's Daily Online/Su Jinggang)

Tourists have fun at Harbin Ice and Snow World in Harbin, known as China’s “ice city” in northeast China’s Heilongjiang Province. (People’s Daily Online/Su Jinggang)

Tourists have fun in an indoor ice and snow theme park at Harbin Ice and Snow World in Harbin, known as China's "ice city" in northeast China's Heilongjiang Province. (People's Daily Online/Su Jinggang)