通过添加参数，可以控制列数以及输出空间的使用方式。

By adding parameters, you can control the number of columns and how the output space is used.

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他们可以控制列宽度，因为他们有很多文本控制办法(断字和对齐)。

They can go for the lower end of column width because they have a lot of control over the text (hyphenation and justification).

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PRINT | NOPRINT选项可用于控制特定列的打印。

The print | NOPRINT option can be used to control the printing of a particular column.

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