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People visit the Niagara Falls during extreme cold weather in Ontario, Canada, on Dec. 30, 2017. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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People walk on a street during extreme cold weather in Toronto, Ontario, Canada, on Dec. 30, 2017. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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Ice and snow are seen in Niagara Falls Park in Ontario, Canada, on Dec. 30, 2017. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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Photo taken on Dec. 30, 2017 shows the frozen channel on Lake Ontario and Toronto skyline in Toronto, Ontario, Canada. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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Ice and snow are seen at the base of the Canadian side of Niagara Falls in Ontario, Canada, on Dec. 30, 2017. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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Ice and snow are seen on the Canadian side of Niagara Falls in Ontario, Canada, on Dec. 30, 2017. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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Visitors take photos with an ice and snow covered building at Niagara Falls in Ontario, Canada, on Dec. 30, 2017. Canada experienced extreme cold weather recently. (Xinhua/Zou Zheng)

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