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↑冰上的路流经加拿大北极圈地区的麦肯兹河每年有两个月的结冰期,成为一条天然的公路。其他时候这一地区的交通运输只能通过
↑ The Ice Path The Mackenzie River, flowing through the Canadian Arctic Circle, has two months of ice each year and becomes a natural highway. At other times the traffic in this area can only pass