This function iterates as many times as the value of the $indentation class variable, and for each iteration it adds the $indentationValue class variable to $xml, and returns it.
此函数需要迭代的次数与 $indentation类变量值相同，对于每次迭代，它将 $indentationValue 类变量添加到 $xml，并将后者返回。
The way of accelerating iteration process was discussed also. By improving Simpson's algorithm, for variable step length, integral operation may increase in speed by one to dozens of times.
本文还讨论了加速迭代过程的方法，将变步长辛普生积分算法作适当的改进，其积分运算速度可提高一到几十倍。
The way of accelerating iteration process was discussed also. By improving Simpson's algorithm, for variable step length, integral operation may increase in speed by one to dozens of times.
本文还讨论了加速迭代过程的方法，将变步长辛普生积分算法作适当的改进，其积分运算速度可提高一到几十倍。
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