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。
We find out that, in drift, region, the motion equation of electron is an oscillation one, which influences the prcbunching of electrons.
在漂移区中考虑直流空间电荷场的影响。我们发现电子运动在该区服从一振荡方程；
We find out that, in drift, region, the motion equation of electron is an oscillation one, which influences the prcbunching of electrons.
在漂移区中考虑直流空间电荷场的影响。我们发现电子运动在该区服从一振荡方程；
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