为了在报表中正确地显示，这些新的列标题要求设置某些显示变量。
These new column headers require certain render variables to be set in order to be displayed correctly in the report.
根据以上设置，职位的标题、位置和发布日期都会在显示职位记录时用到。
According to the above Settings, a job's title, location, and published data will be used when listing job records.
而且，树的标题必须设置为可视的(第21行)，以显示列的标题。
Also, the tree's header must be set as visible (line 21) for the column's headers to display.
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