With a closed system, your company is in the business of being a CA.

在一个封闭系统中，您的公司就起着CA 的作用。

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And key of security system is design and panning of CA.

而系统的安全性关键在于CA的设计与规划。

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And key of security system is design and panning of CA.

而系统的安全性关键在于CA的设计与规划。

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