It is the last line of defense to unknown security vulnerabilities.

以此来作为对未知安全漏洞最后的防御手段。

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Information security not only requires a guarantee on technology and law, but also needs a line of moral defense.

信息安全不仅需要技术、法律层面的保障，而且需要构筑必要的道德防线。

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As the important line of defense of data security, network backup has been a key issue reinserted in network computer architecture.

作为数据安全的重要防线，网络备份已成为一项被纳入网络计算机体系结构的关键问题。

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While vigilance is always the first line of defense, installing a security scanner onto your PCs and Android mobile devices will help keep the bad guys out of your digital fortress.

FORBES: 2012: Year Of The Android And Mac Malware

The pilots' lobby complains that current security measures are unreliable and contends that pilots are the last line of defense against hijackers' turning planes into guided missiles.

CNN: Pilots Packing Heat

"Our first line of defense, meaning the police, our hospital, EMS, our homeland security, they have done a tremendous job, " Lagafuaina said.

CNN: American Samoans pulling together after quake, tsunami