模型以多级安全策略为基础，以全面增强主机安全。
This model based on the multilevel security policy, to increase host security in every aspects.
使用多级撤消可以安全地尝试各种假设分析方案。
With Multiple Level Undo you can safely experiment with various what-if scenarios.
使用多级撤消可以安全地尝试各种假设分析方案。
With Multiple Level Undo you can safely experiment with various what-if scenarios.
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