The execute operation is where the business logic is implemented.
业务逻辑在execute操作中实现。
Once the BusinessLayerProxy has the interface it executes the command via the execute operation.
一旦BusinessLayerProxy有了接口，便通过execute操作来执行命令。
In a real application the execute operation would likely make use of collaborations of classes to perform the necessary business logic.
在现实的应用中，execute可能利用类的协同来执行必要的业务逻辑。
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