以上来源于: WordNet
Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
地磁活动是地球磁场的自然变化，其波动周期为11年。
Variations in Earth’s magnetic field cause them to spin in different ways, each of which leaves the compass in a slightly different chemical state.
地球磁场不同的变化会造成它们不同的自旋方式，每种方式都会让罗盘的化学状态表现出细微的差异。
In other variations, a planet named Nibiru crashes into us or the Earth's magnetic field flips.
其他的版本还有名为Nibiru的行星撞向我们或者地球磁场翻转等灾难。
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