既然已经为当前记录构建了散列，现在就可以打印选定的字段。
Now that the hash is built for the current record, print out the selected fields.
这种特性有实际价值，因为在打印机上打印选定的页面避免了浪费纸张。
This has a practical benefit as it avoids wasting paper when the selected output is to be printed on a printer.
可使用户能够打印文档的很多部分：全部打印、打印选定的页范围或打印选定内容。
You can enable users to print many parts of their documents: print all, print a selected page range, or print a selection.
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