First, we instantiate a header row and add a corner cell to it.

首先，我们实例化一个标题行并向其添加一个左上角单元格。

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Assume top row of selection is header row?

要假设选取的顶端列为标题列吗？

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Assume top row of selection is header row?

要假设选取的顶端列为标题列吗？

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