A cell consists of a cell header followed by the body of the cell itself. The body of the cell is the area of memory which is considered allocated.

内存单元包括一个跟随在单元体后的单元句柄。单元体可以认为是已经分配出去的内存区。

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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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We define a header cell as a cell in the top or side headers, which we also call horizontal and vertical dimensions.

我们将标题单元格 定义为顶部或侧边的标题，也称为水平和竖直维度。

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