Moreover the business workers that initiate those methods are to be traced to corresponding system actors (User Roles) living in the system Use Case model.

此外，发起那些方法的业务操作者将追溯到相应的位于系统用例模型中的系统参与者(用户角色)。

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This type of model, describing how a user interacts with the system, is usually referred to as a use case model.

模型的类别描述了用户怎样和系统交互，它经常被作为用例被提及。

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In this case, instead of checking to see if the field was blank we could invoke a method on a model object to ensure that the current user wasn't already in the system.

在该例中，不是检查字段是否为空，我们可以调用模型对象的方法来确保当前用户已经不在系统中。

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You'll find the requisite shoulder strap in the box, this time with a nifty connector that simply slides onto the camera and locks into place with a thin coin or key, along with a USB cable, AC adapter and, in the case of our test model, a Japanese-language user manual.

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