第一级列表项目的显示是合适的。

The first level items are presented appropriately.

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优先排序器：应用于数据块与加载以确定处理顺序的一个规则与优先级列表。

Prioritizer: a list of rules and priorities applied to chunks and loads to determine order of processing.

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首先，我们必须选择业务任务和相关的用例来根据我们设置的优先级列表。

First, we must choose the business task and associated use cases to work out according to the priority list we set up.

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