确定系统的扩展方法，提高系统模型的精确度。回顾并批评你对“最佳”的定义。
Identify ways to expand your system and increase model fidelity. Review and critique your definition of "optimal".
而且这种加密方式依赖于数据库系统的扩展索引机制，并不能在所有数据库上实现。
Moreover, the encryption method is based on the extended index mechanism of database system, and can not be implemented on all databases.
此方案的关键在于使用了虚拟存储的概念和利用虚拟存储的可组合性来实现系统的扩展。
The key of the method lies in implementing system extension through using the conception of virtual store and the combinability virtual store.
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