This is the function of package!
这就是包装的作用。
Package, which contains two classes: SearchManager and SearchResultBean. The first class implements the search function, and the second class describes the structure of the search result.
搜索子系统放在包sample . dw . paper . lucene . search当中，它包含了两个类，SearchManager和SearchResultBean，第一个类用来实现搜索功能，第二个类用来描述搜索结果的结构。
Instead of tracking included use cases separately from the other use cases, we grouped them in whichever package logically included their function.
代替跟踪被包括的与其他用例分离的用例，我们将这些用例组织到逻辑上包含他们的功能的包中。
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