在我们的示例中，SellAfterBuy策略使用的上下文ID是客户ID和股票ID的组合。

In our example, the SellAfterBuy policy USES a context ID that is a combination of the customer ID and the stock ID.

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此上下文区域在以下场景中非常重要，此场景是组合使用Fan Out、Fan In和Service Invoke原语的特定聚合场景。

This context area is important when you consider the following scenario, which illustrates a particular aggregation scenario using a combination of Fan Out, Fan in, and Service Invoke primitives.

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这包括所有标准控件(按钮、文本区域、组合框、单选按钮)和特殊控件(类型前置字段、树形视图控件、上下文弹出菜单)。

This includes all standard controls (buttons, text-fields, combo boxes, radios) and special controls (type-ahead fields, tree-view controls, contextual pop-up menus).

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