区域-区域是任何形状的复杂区域，它通常被定义为较简单区域的布尔组合。

Regions a region is a complex area of any shape and is generally defined as a Boolean combination of simpler regions.

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建立了占先结构类可以由条件断言(正)布尔组合刻画的充要条件以及有限刻画的充要条件。

We have established the characterization for the classes of preferential structure can be expressed or limited expressed based on Boolean combinations of conditional assertions.

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DB 2 Net Search Extender提供了一种灵活的查询语言，可以根据复杂的获取操作(例如涉及布尔组合、通配符和模糊搜索)寻找相关信息。

DB2 Net search Extender provides a flexible query language to find relevant information based on complex retrieval operations involving Boolean combination, wildcard, and fuzzy search, for example.

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