这些产品分为两大类：ISAPI过滤器和外部设备。
They fall into two categories: ISAPI filters and external devices.
她避免在尾气排放的环境中行走，不使用杀虫剂，购买有机食物，关闭窗户避免外部污染空气进入，在她房间里用空气过滤器。
She avoids walking through exhaust, doesn't use pesticides, buys organic foods, shuts her Windows to keep air pollution outdoors and USES air filters in her home.
这允许灵活地为任何类过滤器分配任意的日志级别，而不存在外部限制。
This provides the flexibility to assign any logging level to any class filter without external restrictions.
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