Using this model, we can realize both the requirements of the static security policy of the system and the dynamic requirements of the real world.

该模型既实现了系统中静态的信息安全访问要求，又实现了权限管理中动态的变化要求。

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In the world that we exist, creation all surround certain law to circulate, then obey the dynamic equilibrium of eco-system.

在我们生存的世界里，万物都在围绕着一定的规律循环着，即遵守着生态系统的动态平衡。

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