包过滤技术实现简单，网络处理性能很高，但缺乏对应用层的保护。
Packet filter technology can be implemented easily and has high performance on network process, but it has no ability to provide protection to application.
流过滤技术应运而生，它结合了包过滤技术和代理技术的优点，以包过滤的外部形态提供对应用层的保护能力。
Stream filter technology has emerged, which combines the merits of packet filter and proxy technology and provides protection to application in the form of packet filter.
流过滤技术是对包过滤、状态检测及应用代理的一种“融合”，实现了高性能、可扩展、透明的对应用层协议的保护。
Flow filtration technology is a kind of "integration" which compounds packet filtration, state detection and the agent of application.
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