A partitioning key should include one to three columns.

一个分区键应该包括一至三个列。

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A preview now shows three columns with subject, number, and last modification date.

预览现在显示三列，它们是主题、数量和最后一次修改日期。

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We already started looking for functional continuity in the previous section by adding three columns.

我们在前一节中添加了三列，这正是保持功能连续性的第一步。

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The website switches from a three-column format to two-columns letting the main news feed take up more space.

BBC: Facebook news feed revamp learns lessons from mobile

Each Rich-lister got the exact same page, with proprietary data, real-time content and their social connections all neatly organized in three columns.

FORBES: Inside Forbes: How Our New Typeahead Search Makes It Fast and Easy for Readers

It's a timber cabin grown grand, three stories' worth, with a big front porch supported by tree-trunk columns.

FORBES: Magazine Article