Lymphatic and mononuclear phagocyte system is the body of the second line of defense.

淋巴和单核吞噬细胞系统是机体的第二道防线。

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As the second line of defense for computer and network systems, intrusion detection systems (IDSs) have been deployed increasingly wider.

作为保护计算机和网络系统的第二道防线，入侵检测系统的应用的越来越广泛。

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A second line of defense is a risk mitigation strategy, in this case blocking accumulation of the new material in the grain.

第二道防线是风险减轻策略，在这种情况下是阻止作物中新材料的积累。

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But the Federation for American Immigration Reform said the interior stations are a needed "second line of defense" to track down and apprehend illegal immigrants who make it past international borders and into heavily traveled corridors in the United States.

CNN: STORY HIGHLIGHTS

This is the longer-term thinking about US defense strategy, which is the policy organization's second major line of effort.

CENTERFORSECURITYPOLICY: Transforming the United States Global Defense Post