The key here is that the ordering system is implemented to accept a single record, whereas the input into the mediation module is a nested batch message.
这里的关键是将订单系统实现为接收单个记录，而到中介模块的输入是嵌套式批处理消息。
This introduces the need for aggregation, and in this case nested aggregation, because the batch request message is repeated on an outlet basis and then repeated on an order basis.
这将引入对聚合的需求，并且在这种情况需要使用嵌套聚合。因为批处理请求消息是以分店为基础重复的，然后以订单为基础重复。
For example, the occasional elephant interrupts your flow of mice for several seconds and you cannot tune channel batch sizes to accommodate both message types.
例如，偶尔大象会将您的老鼠流中断几秒钟，并且您无法优化通道批量大小以同时适应这两种消息类型。
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