The researching key point in the paper is the design and realization of the packet filter technology in individual security defense system.

本文研究的重点是个人安全防御系统中包过滤技术的设计与实现。

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Multitarget interception is a big difficult problem in ballistic missile defense, and is also the most arduous technology of the missile defense system of US.

多目标拦截是弹道导弹防御的重大难题，也是目前美国导弹防御系统所遇到的最大的技术难点。

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The design of a defense system was proposed against the worm-virus based on spam. And the immunization technology was used into the system.

提出了一种针对垃圾邮件蠕虫病毒的防御系统设计，将免疫防护的思想应用到病毒检测系统中。

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"The best way to responsibly advance our security and the security of our allies is to deploy a missile defense system that best responds to the threats that we face and that utilizes technology that is both proven and cost effective."

VOA: standard.2009.09.17

They would be a block against invasion, and the Aegis missile technology on this class of destroyer could someday be upgraded to a missile defense system.

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The reason they call it a "family system" or a "layered defense" is that the tracking and targeting systems of each layer of technology enhance each others accuracy.

CENTERFORSECURITYPOLICY: 33 Minutes