这种设计的好处就是，内核的体积大大减小，用户态的服务线程提高了系统的灵活性和安全性。

The benefit of microkernel and user-level system service is the greatly reduced kernel size, together with the flexibility and security of the whole system.

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鲍勃曾写了几本很不错的书，认为有必要引入更好的劳动管理协调，并且有必要加强现代工作场所中的灵活性和安全性。

Bob had written some good books on the need for greater labor-management cooperation and the importance of both flexibility and security in the modern workplace.

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基于PKI的认证方法提供了较好的灵活性和安全性，但计算量较大，CA服务器也易于成为网络瓶颈和攻击目标。

Although PKI-based authentication provides better flexibility and security, the computation load is much heavier, also ca servers will become network bottlenecks and attacking targets.

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