我们创建一个称为HeaderCell的包装器类，用于区分标题栏单元格和内容单元格。

We created a wrapper class, called HeaderCell to distinguish a header cell form a content cell.

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帮助读者区分不同的标题级别。

Help readers distinguish different heading levels.

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这种格式有助于将其与呈现在标题下面的数据进行区分。

This format helps differentiate them from the data that is rendered below the headers.

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