The Product line and Product type columns would have a grouping and summary applied.
Product line和Product type列要应用一个分组和摘要。
Lists can have multiple summary views that selectively display which fields (that is, columns) to show as part of the view.
List可以具有多个摘要视图，这些视图可以有选择地显示要显示为视图一部分的字段(即列)。
Similarly four columns of the structure for the summary reflects the change in accumulated depreciation.
与此类似的四栏式结构也用于汇总反映累计折旧的变动。
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