slow-drift oscillation 缓慢漂移摆荡
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；
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