名词
中文翻译：年度磁变化
同义词：
['annual variation', 'annual change例句：1. This is the first time we have observed an annual magnetic change in this region.（这是我们首次观察到该地区的年度磁变化。）']
例句：
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1. This is the first time we have observed an annual magnetic change in this region.
这是我们首次观察到该地区的年度磁变化。
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2.The scientists were surprised to find that there was an annual magnetic change in their experiment.
科学家们惊讶地发现，他们的实验中出现了年度磁变化。
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3. Due to the annual magnetic change, the Earth's magnetic field can vary significantly from year to year.
由于年度磁变化，地球的磁场每年都会有很大的波动。