该方法将返回嵌套的单元格数据数组，其中每个单元格使用它的行坐标和列坐标进行索引。
This method returns a nested array of cell data, with each cell indexed by its row and column coordinates.
表中每行有多少单元格，这个数组中就有多少个函数。
There are as many functions in this array as there are cells in each table row.
每个单元格的公式和最终值也包含在嵌套数组中。
The formula and final value for each cell are also included in the nested array.
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