The service providers also connect to the message bus and listen for request messages.
服务提供者也连接到消息总线，并侦听请求消息。
Request/Response processing in a bus
总线中的请求/响应处理
Figure 2-8. The flow of a read request for a device on a secondary bus.
图2 - 8。在一个二级总线上对于一个设备的读请求的流程。
The bus to the supermarket will stop anywhere by request.
去超市的公共汽车会应人请求随时停车。
The flow of a read request for a device on a secondary bus.
在一个二级总线上对于一个设备的读请求的流程。
The bus driver will give you a bus timetable on request.
如果您索要公共汽车时间表的话，司机会给您一份的。
The bus driver will give you a bus timetable on request.
如果您索要公共汽车时间表的话，司机会给您一份的。
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