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从地质记录中寻找周期是科学家最感兴趣的事情之一。最近，Hazen利Trefil（1991）提出了20条科学论点，并提到了地球上的所有事物都以周期模式运转．这个想法在最近对百万个不同的长期的陆地及防外时间序列的周期性分析中得到证实、尤其是RauP利Sepkoski（1984）关于海洋种群灭
Finding the cycle from geological records is one of the most interesting things for scientists. Recently, Hazenli Trefil (1991) presented 20 scientific arguments and mentions that everything on Earth works in a periodic mode. This idea was confirmed recently in the periodic analysis of millions of different long-term land-based and out-of-time time series, especially by Raupli Sepkoski (1984)