对于人体而言，每个器官都有其特定的功能。
As far as the human body is concerned, each organ has its specific function.
但是，单个安全技术或者安全产品(安全部件)的功能和性能都有其局限性，只能满足系统与网络特定的安全需求。
But the capability of single security technology or security product (security component) is limited, which can only meet specific security need of system and network.
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