As each service defines a different format, two different transformations have to be performed before sending the message to the correct service.
由于每个服务定义了不同的格式，在发送消息给正确的服务之前必须完成两种不同的转换。
The caller can't just put any request message format on any request channel; it has to know exactly the right message format and channel for the specific service it wishes to invoke.
调用方不能将所有的请求消息格式都放置在任何一个请求通道上；它必须准确地知道希望调用的特定服务的正确消息格式和通道。
It also does the reverse transformation from the service response message format to the format of the originating request.
中介模块还执行从服务响应消息格式到原始请求格式的逆向转换。
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