polar sphere

例句：

1. 1. The scientists discovered the polar sphere's magnetic field has a unique pattern.
   科学家们发现极地球体的磁场具有独特的模式。
2. 2.The polar sphere is an area of ice and snow that covers much of the Earth's northern hemisphere.
   极地球是一个覆盖地球北半球大部分地区的冰和雪的区域。
3. 3. The polar sphere is home to many species of animals that are adapted to survive in extreme cold temperatures.
   极地球是许多适应极端寒冷温度的物种的家园。