表达式使得你可以为每个订单增加相应的客户姓名。
The expression would allow you to also add in the customer name for each order.
顾客拥有以前订单的集合，每个订单包含几个商品。
The customer has a collection of previous orders, and each order consists of several items.
引入中介流的初始消息通过客户ID标识每个订单的客户。
The original message coming into the mediation flow identifies the customer for each order via a customer id.
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