Each frame in the three levels is an inherent unity, a common framework for the different characteristics of shape.

各自框架在高中低三层次具有内在的统一性，共同塑造不同的框架特征。

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Each frame in the three levels is an inherent unity, a common framework for the different characteristics of shape.

各自框架在高中低三层次具有内在的统一性，共同塑造不同的框架特征。

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