各种过滤方式中，死端过滤效率最高；
过滤器还很有效率，因为它们一接收到事件就会处理这些事件。
Filters are also efficient because they process events as soon as they are received.
像大多数过滤器、定期清理必须做的，以维持其工作效率。
Like most filters, regular cleaning must be done to maintain its efficiency.
高精密过滤，过滤面积广、效率高、操作简单、清洗容易。
F. High-precision filter, filter wide area, high efficiency, simple operation, easy to clean.
高精密过滤，过滤面积广、效率高、操作简单、清洗容易。
F. High-precision filter, filter wide area, high efficiency, simple operation, easy to clean.
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