这些参数被定义为必须通过报告传递的实参。

The parameters are defined as arguments that have to be passed by the report.

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表达式定义了一个参数，稍后，根据所单击的产品，该参数将被第一个报告传递。

Expression defines a parameter which will later be passed by the first report depending on which product you click.

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许多报告需要多次传递数据，以便对数据进行选择、汇总和分类。

Many reports required multiple passes on the data to select, aggregate, and sort the data.

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