给系统输入未经描述的大量图像，当输出的图像与输入的相似的时候，系统就知道它找到了合适的过滤器。
Instead, the system is shown lots of pictures without being told what they depict. It knows it is on to a promising filter when the output image resembles the input.
门户过滤器将处理过的内容返回给客户机。
The Portal Filter returns the processed contents to the client.
给空调和加湿器的过滤器消毒。
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