A：更改订单的程序是怎样的？

A: How do you process a change of order?

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通过更改订阅到特定主题的一组服务，可以完全更改组合服务的实现。

By changing a set of services that are subscribed to a particular topic, it is possible to completely change implementation of a composite service.

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updateOrder 操作允许更改订单的总金额。

The updateOrder operation allows the total dollar amount of the order to be changed.

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