There is a practical limit to reducing bandwidth since very long - term measurements become susceptible to other errors, such as time and temperature drift.
减小带宽时有一个实际的限制，如果测量时间太长，测量就容易受到时间和温度漂移等其它误差的影响。
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。
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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