To improve understandability of the sequence diagram, I introduced a generic use case controller object to mediate the messages received by the human customer actor.
为了使序列图更易理解，我引入了一般的用例控制器对象来为消费者参与者收到的信息提供中介。
When modeling a sequence diagram, there will be times that an object will need to send a message to itself.
当序列图建模时，有时候，一个对象将会需要传递一个消息给它本身。
In a sequence diagram, object interactions are illustrated in a kind of fence format, adding objects from left to right.
在序列图中，对象交互以一种栅栏的格式显示，并从左到右添加对象。
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