过滤器的用法和样例：
例句
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加装了防护过滤器以后，这烟囟已不再散发成股的废气到大气中去了。
The chimney is no longer giving off volumes of waste gas into the atmosphere, as protective filters are being used. -
代理防火墙比包过滤器防火墙易于保持更多的上下文
The proxy firewall maintain context more easily than the packet filter firewall. -
内部和外部包过滤器和一台单向定位的bastion主机的配置提供很好的安全性。
The configuration of internal and external packet filter and a single home bastion host provide very good security. -
在燃料进入发动机之前，过滤器先把它过滤。
The filter cleans the fuel before it enters the engine.
