radiation belts of the Earth

例句：

1. 1. The Earth's radiation belts are a naturalbarrier against cosmic rays.
   地球的辐射带是抵御宇宙射线的一种自然屏障。
2. 2. The scientists studied the radiation beltsto understand their impact on the environment.
   科学家们研究辐射带，以了解它们对环境的影响。
3. 3. The radiation belts are responsiblefor the ionization of the upperatmosphere.
   辐射带负责使上层大气电离。