表头可为简单表头或多重表头，表头标题自动居中（大于列宽度时换行打印）；
The heading may be a single one or more and the title will be typed out in the middle of the paper automatically (If it is beyond the given width, it will move to another line).
表头可为简单表头或多重表头，表头标题自动居中（大于列宽度时换行打印）；
The heading may be a single one or more and the title will be typed out in the middle of the paper automatically (If it is beyond the given width, it will move to another line).
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