Also, Windows 7 still requires add-on security software that has to be frequently updated.

此外，Windows 7还需要安全软件插件，必须频繁更新。

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As a result, these add-on features end up being more of a reliability mechanism than a security mechanism.

结果，与其说这些添加的功能部件是安全性机制，不如说它们是可靠性机制。

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On the other hand it will add to the security of China's neighbours.

另一方面，它将提升中国邻邦的安全。

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Zell Miller will add so-called values issues to Monday's focus on national security and Tuesday's emphasis on domestic issues.

CNN: Playing to the base

The municipalities hosting two New York City-area marathons Sunday will add police and clamp new security measures on runners and spectators following last month's bombing at the Boston Marathon.

WSJ: New York Area Races Increase Security After Boston Marathon Bombing

One of the other things that has been a steep learning curve for us - painfully so, I may add -is that we have come to have unanimity on the fact that security is a precondition not only for the political progress that we have just been talking about the last 15 or so minutes, but also for economic and social progress.

NPR: Is the Iraq Surge Strategy Working?