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.
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.
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