Then we introduce the basics of the theory of frames, which intuitively correspond to over complete, non-orthogonal systems of basis functions.

然后我们将完整的介绍架构理论的基础，亦即直观符合非正交系统的基本功能。

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Using this orthogonal functions model, an approximate formula of dispersion in PCFs was deduced in theory.

通过该正交函数模型，从理论上推导出了PCF的色散估算公式。

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