The Van Allen belts are composed of charged particles trapped by the earth's magnetic field.
范阿伦带由地球磁场俘获的带电粒子所组成。
The van allen belts are composed of charged particles trapped by the earth's magnetic field .
范阿伦带由地球磁场俘获的带电粒子所组成。
The van allen belts are composed of charged particles trapped by the earth's magnetic field .
范阿伦带由地球磁场俘获的带电粒子所组成。
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