periodicity of structure

例句：

1. 1. The periodicity of the moon's phases is fascinating to observe.
   月球相位的周期性令人着迷。
2. 2.The periodicity of the earth's rotation is essential for understanding its geography.
   地球自转的周期性对于理解其地理学至关重要。
3. 3. The periodicity of the weather patterns can be predicted with a high degree of accuracy.
   天气模式的周期性可以高度准确地预测。