“secular polar motion”的概念、定义、翻译、参考文献-科学参考

单词	secular polar motion
释义	secular polar motion Encyclopedia 理学地极移动释 secular polar motion长期极移地极轨线除了表现为周期性的螺旋运动外，还有偏离固定平极向一定方向的移动。这种移动称为长期极移。 Astronomy secular polar motion长期极移
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