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        英語聽力 學英語,練聽力,上聽力課堂! 注冊 登錄
        > 在線聽力 > 英語高級聽力 > 英語時差 >  第731課

        英語時差:在冬季,是最好的駕駛季節

        所屬教程:英語時差

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        xijijun

        2021年01月01日

        手機版
        掃描二維碼方便學習和分享
        https://online2.tingclass.net/lesson/shi0529/10000/10183/731.mp3
        https://image.tingclass.net/statics/js/2012
        In Canada's arctic, winter is the best driving season because every winter, ice roads are built over frozen rivers and lakes, connecting communities that are usually accessible only by air. Ice is surprisingly strong and forms early in the arctic. By December, it can support light trucks, and by January, the ice is more than a yard thick, allowing full size transport trucks to deliver fuel, food and other goods more easily and cheaply than aircraft. This means that many things are cheaper in the arctic in the dead of winter because they don't have to be flown in.

        But ice roads are more than just frozen rivers. Road crews improve the ice road by taking advantage of the fact that ice floats. They drill holes in the ice and drive light trucks over them. The floating ice gives a little under the weight of the truck and forces water up through the holes where it spreads out to form a thin layer. This water then freezes and thickens the ice road. Road crews also maintain the road by plowing regularly, since open ice freezes more solidly than snow-covered ice.

        Although ice roads are plowed like regular roads, they offer a different driving experience. Because ice has give, a wave is created under it as the vehicle drives on top. Driving too fast can create a wave strong enough to crack the ice, especially as you approach the shore. So the speed limit is about 10 miles per hour.

        In May, the ice breaks up and is washed away into the sea. So, if you want to drive up to Aklavik or Tuktoyaktuk, to see the northern lights, you'd better plan on winter driving.

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