冬天下雪或者地面结冰的时候，狗狗的嗅觉很容易受影响从而迷路。
It's very easy for pups to lose their scent and get lost when snow or ice is on the ground.
周围积雪很深，地面结冰，动物们的生活会变得困难。
There is lots of snow around and the ground freezes, which can make life difficult for animals.
如果全球变暖扰乱了这些水流，这些北部区域的温度会骤降，甚至会使地面结冰。
If global warming disrupts these currents, temperatures in these northern areas will plummet and the land might even become covered in ice.
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