“magnetic annual variation”的概念、定义、翻译、参考文献-科学参考

单词	magnetic annual variation
释义	magnetic annual variation [mag`ned·ik `an·yǝ·wǝl ´ver·ē`ā·shǝn] ^GEOPHYSICS The small, systematic temporal variation in the earth's magnetic field which occurs after the trend for secular change has been removed from the average monthly values. Also known as annual magnetic variation.
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