提要聚合器是一个包装器组件，用来包装提要阅读器组件以实现本文的主要目标：创建一个可定制的rss提要聚合函数。
Feed aggregator is a wrapper component that wraps the feed reader component to meet the main objective of this article: to create a customizable RSS feed aggregation function.
用我们自己的小部件来包装选择控件让我们能够将所有与此提要集合相关的表示逻辑（添加和删除提要）都放到同一个地方。
Wrapping the select with our own widget allows us to put all the presentation logic related to the feed selection (adding and removing feeds) in a single place.
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