在本例中(在以下代码示例中概述)，cargo只是不断将反馈传送给迭代函数的一个数字。

In this case (outlined in following code example) the cargo is just a number that keeps getting fed back into an iterative function.

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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。

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.

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此函数在每个月的数据中迭代。

This function iterates over each month of data.

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