The intrusion detection become the second floor defense line of the network security.

入侵检测已成为网络安全的第二层重要防御线。

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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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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.

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