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