入侵检测是网络安全的第二道防线。
The intrusion detection is the second floor defence line of the network security.
淋巴和单核吞噬细胞系统是机体的第二道防线。
Lymphatic and mononuclear phagocyte system is the body of the second line of defense.
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。
A second line of defense is a risk mitigation strategy, in this case blocking accumulation of the new material in the grain.
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