周期变动（cyclical variation）即以某一时间间隔为 周期的周期性变动，如危机和复苏的交替。 季节变动（seasonal variation）。
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气压非周期变动 barometric non-periodic changes
周期性变动 [数] Cyclical variation ; fluctuation ; rhythm ; cyclity-C
变动周期操作 Operational Amplifier
变动周期 period of variance
心动周期变异性 heart period variability
的心动周期变异幅度 CVIB ; cyclic variation of integrated backscatter
及其心动周期变化幅度 cyclic variation in integrated backscatter
Based on cyclic graph,this paper mensurate the connotaaive cycles of variable and give a kind of forecasting model with cyclic fluctuation,an instance indicates that this kind model improve the accuracy of economic forecasting.
本文利用周期图方法 ,搜索出变量的隐含周期 ,并在此基础上 ,构造含周期变动项的预测模型。
参考来源 - 含周期变动项的预测模型的建立与应用·2,447,543篇论文数据，部分数据来源于NoteExpress
这些X射线的强度会根据黑洞的质量而周期变动。
The intensity of those X-rays can vary periodically, depending on the black hole's mass.
导致折现期变动的因素主要包括投资周期变动和技术风险等。
The factors cause to project period alteration include invest cycle change and technical risk etc. mainly.
在判断收入不平等时，为何收入短期变动和在整个生命周期变动，引起一些困难。
When gauging the amount of inequality, why do transitory and life cycle variations in income cause difficulties?
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