The elements in the Reference column specialize the elements in the Topic column.

引用列中的元素专门化了主题列中的元素。

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Figure 8 shows that the left outer join operations are cascaded if a rule USES more than one reference column.

图8展示了如果规则使用了多个参考列，那么左外部连接就进行级联。

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If a column reference is found, then include the column's table to the fact's set of tables.

如果找到列引用，那么将这个列所在的表包含到事实的表集中。

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Nor is there any such reference in our private papers, which we thoroughly reviewed in preparing Friday's column.

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