查询需要实时数据，例如股票报价、现有存货目录。
Query requires real-time data, such as stock quote, on-hand inventory.
你可以应用同步消息的方法来创建其他的交换模式，比如接收多重通知请求(例如在股票报价变更的通知)。
You could apply either means of asynchronous messaging to create other exchange patterns, such as a request to receive multiple notifications (such as notifications for changes in stock quotes).
最常见的情况是门户应用程序，它接受来自各种提供者的内容(例如，天气信息、股票报价和新闻)，通常附带有提供者的标记。
The most common case is the portal application, which receives content from a variety of providers (weather, stock quotes, and news, for example), often with branding from the provider.
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