To show how the defense in depth works, we will first examine a centric model of three primary layers: core, middle, and outermost.

为了演示深度防御的工作原理，我们将首先研究包含三个主要层次的中心模型：核心层、中间层和最外层。

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In pseudo, we adopted multiple layers of defense against this.

在pseudo中，我们采用多层防御措施防止出现这种问题。

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These organizations have survived thousands of attacks over the years and they have invested in multiple layers of defense.

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The presence on flights of gun-carrying pilots traveling as passengers, federal air marshals and airline crew members trained in self-defense provide additional layers of security to protect against misuse of the items, he said.

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While it will still make sense to have multiple layers of defense against hostile missiles in which Aegis is only part of the solution, at present it is the part of the solution that looks most cost-effective.

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