This feature can be used to tune database performance according to periodic changes in use, such as switching from daytime interactive use to nighttime batch work.

可以使用这个功能，根据使用过程中的周期变化(例如从白天的交互式使用转换到夜间的批处理工作)来调优数据库性能。

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The organic carbon content is in close relation to productivity in the ocean, which can be used to reconstruct the long periodic changes in ocean paleoproductivity.

有机碳含量与海洋生产力关系极为密切，它可用来重建海洋古生产力的长期变化。

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Analyzing the sequence of the parameters by the power and cross spectra yields main periodic changes of quasi-two-week oscillation.

对三参数序列应用功率谱和交叉谱分析得出，其主要周期变化为准两周振荡。

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Standard deviation also adjusts for periodic changes in scheduling balance over the years, such as the breakdown of each league into two (and then three) divisions, and interleague play.

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