A second, more subtle reason is that the model, not the diagrams, becomes the expression of record for the structure, semantics, and behavior of the system.
其次，更细微的原因是模型，不是图，成为系统的结构、语义和行为的记录的表示。
There is a stylised model of what is meant to happen when the shadow banking system contracts, in which Banks act as "lenders of second-to-last resort".
当影子银行系统收缩时将会发生什么？关于这个问题存在一个程序化模型，商业银行在其中充当仅次于最后贷款人的角色。
Second, the use cases are analyzed to build the system analysis model that represents a hypothetical architecture for the software.
第二，分析用例来构建表示软件推测架构的系统分析模型。
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