While customer orders are still coming in, fulfillment is stalled because the warehouse server is having a network controller problem.
虽然客户订单仍然不断地提交进来，但订单执行却因为仓库服务器出现网络控制器问题而停止。
2
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。
3
Important: it is important that the person installing Controller provides the customer with good client installation instructions.