polar impulse

例句：

1. 1. The polar ice caps are the largest bodies of frozen water on Earth.
   极地冰盖是地球上最大的冻土体。
2. 2.The polar bear is a large carnivorous mammal that lives in the Arctic.
   北极熊是一种大型食肉哺乳动物，生活在北极地区。
3. 3.The polar bear's ability to survive in the extreme cold conditions is due to its thick fur and strong blubber.
   北极熊能在极端寒冷的条件下生存，这得益于它厚厚的皮毛和强壮的脂肪层。