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。

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In the second chapter, the variable structure control problem of a class of uncertain distributed parameter system is studied.

第二章，研究了一类不确定分布参数系统的变结构控制问题。

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The Association of School and College Leaders has warned that confusion over its complex structure and a low take-up rate could doom the qualification to second-class status.

BBC: Heads demand answers on Diplomas