深度防御背后的理念很简单：永远不要仅依赖于一种安全方法。
The idea behind defense in depth is simple: Never rely on just one security method.
和任何事情一样，深度防御也是安全性和适用性之间的平衡。
As with anything else, defense in depth is a balance between security and utility.
和任何事情一样，深度防御也是安全性和适用性之间的平衡。
As with anything else, defense in depth is a balance between security and utility.
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