In the near future at clustering periodic time series data study up have more and more extensive trend.

近期在周期性时间序列资料分群研究上有越来越广泛的趋势。

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For periodic waveforms, the Fourier series representations are valid over all time.

对于周期波形，傅立叶级数表示法在整个时间段都是有效的。

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The periodic occurrence of any sedimentary event may be expressed by the frequency in the time series.

某一沉积事件周期性出现的频繁程度可用时间序列中的频率来表示。

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