The study found that there are still a long-term polar drift and cycle of about 30 years of long-period oscillation.

经研究，发现地极还存在长期的漂移和周期约30年的长周期摆动。

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The study found that there are still a long-term polar drift and cycle of about 30 years of long-period oscillation.

经研究，发现地极还存在长期的漂移和周期约30年的长周期摆动。

youdao