call-back message

基本解释

The client code would either poll the output queue for the response or wait for some kind of call-back notification when the response message has been delivered.
客户机代码将轮询输出队列以获得响应，或等待响应消息交付时的回调通知。
In this scenario, clients (be they Web-based, Web services based, message-based, or even desktop) make a single call to the back end to perform a particular request.
在此场景中，客户机（基于 Web、基于 Web 服务、基于消息或者甚至桌面）向后端发起单个调用以执行特定的请求。
I would write a friendly message on a post-it note and then call her as soon as I arrived back at my office, interrupting her phone call.
这个时候我会留下一条措辞友好的即时贴，然后在我回到办公室后马上给她打电话，打断她的电话。