客户端调用服务组件处理订单。
The client invokes the service component to process the order.
我们希望EIS组件处理编码，并立即调用EIS。
We want the EIS component to deal with the encoding and the right way to call the EIS.
一个组件的用户需要知道组件处理的输入/输出消息。
The user of a component only needs to know the input/output messages that the component handles.
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