我们面对的世代是 -- 与实体世界融合在一起的运算.如果你没有平面可用，手掌也可以处理简单的功能。
So, we are looking for an era where computing will actually merge with the physical world. And, of course, if you don't have any surface, you can start using your palm for simple operations.
地层实体用多面体的边界表示法来表示，由布尔集合运算来获得。
The final solids of strata are represented by polygonal boundary representations, which are constructed by Boolean set operations.
利用齿坯实体模型和刀具实体模型做布尔减运算，来实现模拟工件材料的去除过程；
The cutting process was performed through subtraction boolean operation of the solid model of workpiece and cutter.
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