A scenario is an instance of the use case.
一个场景是用例的一个实例。
Whereas use cases capture a generalized view of a user and a task, scenarios describe a specific instance of a use case in terms of a concrete workflow.
尽管用例获取用户和任务的一般化观点，但是依据具体的工作流，情境描述具体的用例实例。
The second use case involves caching data which is only relevant for one portlet instance, and the data is specific to a portlet window.
第二个用例涉及到了只与某个 Portlet 实例有关的缓存数据，并且数据是特定于 Portlet 窗口的。
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