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.
第一个命令创建数据库(如果数据库还不存在的话)和一个表，这个表包含两列——期号和标题。
The first command creates the database (if it does not exist already) as well as a table with two columns, an issue number, and a title.
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.
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