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 of long-period seismic wave is significant to the seismic design of the large-span engineering structures with long auto-oscillation period.
用丰富的高质量数字强震记录对台湾集集大地震及余震的长周期地震动特性进行了研究。
The study of long-period seismic wave is significant to the seismic design of the large-span engineering structures with long auto-oscillation period.
用丰富的高质量数字强震记录对台湾集集大地震及余震的长周期地震动特性进行了研究。
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