与控制每个细节(需求和设计)方面相比，领导组把具体的活动放到稍低的层次显得更加合理。

Instead of trying to control every aspect of specification (requirements and design), it is better for the leadership group to actively push specification activities into lower project levels.

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Visitor设计模式用于把异常层次与构建故障详细信息的代码分开。

The Visitor design pattern is used to separate the exception hierarchy from the code that builds the fault details.

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从某些方面而言，此模式与层次相关，因为可以使用类似的模式来设计每个层次边界的交互。

In some ways, this pattern relates to tiers, as you can use a similar pattern to design the interactions at each tier boundary.

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