The periodic solution can be bifurcated from equilibrium point with the variation of parameters.

系统随着参数的变化，从平衡点分岔出周期解。

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Firstly, it directly influences the periodic variation of precipitation and air temperature, then influences the periodic variation of runoff based on the underlying surface.

天体运动直接影响降水和气温的周期变化，进而在一定的下垫面条件下，影响径流的周期变化。

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This paper analyses the area distribution and periodic variation of intensity of the urban heat island in southeastern coastal cities of Fujian Province.

本文分析了闽东南沿海城市的热岛强度的平面分布和周期性变化。

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So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.

不像水或者空气密度的,周期变化，我们这里,讨论的是电场。

麻省理工公开课 - 化学原理课程节选

So, for example, we have this average level, and then it can go high where we have the peak, or it can go very low. We can also discuss sound waves, so again it's just the periodic variation of some property -- in this case we're talking about density, so we have high density areas and low density areas.

例如这是平均位置，在峰的位置水位高，在谷水位低，我们也可以,讨论声波它也是某种,量的周期变化，在这里我们,讨论的是密度,我们有高密度区和低密度区。

麻省理工公开课 - 化学原理课程节选