这是实现业务逻辑目标的关键。
This forms the crux of the business logic for this objective.
目的地是每一条发送到总线上的消息的逻辑目标。
A destination is the logical target for each message that is sent to the bus.
换言之，一个单一的逻辑目标可以代表许多物理目标。
In other words, a single logical destination can represent many physical destinations.
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