第一列通常具有与块大小数据相对应的标题，它显示了磁盘的总大小。
The first column, usually with a header according to the block size data, shows the total size of the disk.
对列标题分组将会使网格数据看上去更清晰更灵活。
Grouping column headers gives a clearer and more flexible representation of grid data.
填入竖直维度的标题数据是将网格最左侧列转换成矩阵竖直维度的第二步，也是最后一步。
Filling in the data for the titles of the headers of the vertical dimension is the second and final step for turning the left-most column of the grid into the vertical dimension of the matrix.
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