There should only be one messaging engine listed for TestBus.
应该只为TestBus列出了一个消息传递引擎。
In our simple setup, we have one bus with one bus member with one messaging engine.
在我们的简单设置中，我们有一个总线，带有一个成员和一个消息传递引擎。
In the case of a single Gold topology in the cell, this is acceptable because there is only one messaging engine to choose from.
对于单元中单个黄金拓扑的情况，这是可以接受的，因为只有一个消息传递引擎供选择。
Publication points are used not only for applications to add and remove messages on topics, but also to propagate messages from one messaging engine to the others in the bus.
发布点不仅供应用程序用于添加和删除与主题有关的消息，还可用于将来自一个消息传递引擎的消息传播到总线中的其他消息传递引擎上。
The challenge is that there is not one consistent approach or API to deal with these different mechanisms, and in most real SOA environments, you will come across more than one messaging protocol.
问题是没有一个一致的方法或API来处理这些不同的机制，而且在大多数实际的SOA环境中，您会遇到多个消息传递协议。
A bus may be configured in a variety of ways to span multiple servers (that is, it can have multiple bus members), but there is always at least one messaging engine for each server in a specific bus.
可以以多种方式将总线配置为跨多个服务器(即，它可以具有多个总线成员)，但是在特定的总线中每个服务器始终至少有一个消息传递引擎。
A bus may be configured in a variety of ways to span multiple servers (that is, it can have multiple bus members), but there is always at least one messaging engine for each server in a specific bus.
可以以多种方式将总线配置为跨多个服务器(即，它可以具有多个总线成员)，但是在特定的总线中每个服务器始终至少有一个消息传递引擎。
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