The 31st Harbin International Ice and Snow Festival

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Visitors walk past a train-shaped ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Workers polish a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Visitors take pictures with a bell which is displayed with ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A visitor makes her way in a maze which is made by ice bricks ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A woman rides a slide on an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Visitors use kaleidoscopes which are displayed with ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A worker polishes a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A visitor has his picture taken with a piano-shaped ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A couple takes a picture with an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A visitor takes a picture with an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Visitors look around ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A worker polishes an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Workers polish a snow sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Visitors walking past an ice sculpture are seen through a frozen window ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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People visit a maze which was built by ice bricks and illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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A man rides a slide on an ice sculpture illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)

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Tourists sit on a horse-drawn carriage in front of ice sculptures illuminated by coloured lights, during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. (Photo by Kim Kyung-Hoon/Reuters)