Rule 3: Write an escape clause.

规则3：写出一个例外条款。

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Instead, use a virtual table with a WHERE clause, or define the join as a view in the data source, and execute the rule on this view.

相反，可使用具有where子句的虚拟表，或者将连接作为数据源的视图进行定义，并在这一视图中执行规则。

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And a final clause would tidy up a rule under which all descendants of George II, an 18-century monarch, require royal permission to marry.

最后一则条款将重新整理乔治二世(十八世纪君主)的后裔结婚需获得皇家允许的规定。

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