The right pane, named variable pane, lists the variables required for metrics calculation.
右边的面板（名为 variable）列出指标计算所需的变量。
For -append and -prefix, the value associated with the named variable must be a single string value.
对于- append和- prefix，与指定变量关联的值必须是单个字符串值。
Because this page reuses that value in several places, I find it more convenient to store it a descriptively named variable.
因为该页面在多处重用这个值，我发现用一个含义明确的变量来存储会更方便。
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