A practical formula and an example of calculation are also given in the paper.

并给出了实用计算公式与计算实例。

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Finally we discuss the application of our formula by a practical example.

最后，通过具体实例说明公式的应用。

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Finally we discuss the application of our formula by a practical example.

最后，通过具体实例说明公式的应用。

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