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.
一个1000英尺(300米)的再循环水系统，并且其配管的直径一致，则需要25小时的经过滤的再循环来去除总微粒。
A recirculating water system of 1000 feet (300 meters) with a consistent tube diameter would require as much as 25 hours of filtered recirculation time for total particle removal.
过滤式防微粒口罩总透漏率的试验方法。
Test method for total inward leakage of filtering particle respirator.
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