然而，作为一个总规则，每个特定的情况应努力事先最高级别的可追溯性。

Nevertheless, as a general rule, the highest possible level of traceability should be tried to achieve in every given situation.

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但规则是建立在分布的等级之上的，而这些分布并不总存在于这个世界里。

But the rules are based on classes of distribution that don't always hold in our world.

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您可通过定义具有过滤条件的虚拟表，来有效地减少从源所读取记录的数量，并减小规则的总执行时间。

You can effectively reduce the number of records that are read from the source, and reduce the overall execution time of a rule, by defining a virtual table with a filter condition.

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