该方法中的被剪切对象是较为复杂的几何实体，包括圆弧以及带有圆弧边界和带有洞的复杂多边形对象，其中剪裁窗口可以为凹多边形或凸多边形。
The cutting object is complicacy geometry entity, which is complicacy polygon with arc, arc boundary and hole, the cutting window can be cave or convex polygon.
为模拟大气边界层，实验段较长，实验模型放在实验段后部。为减小轴向静压梯度顶板高度分段可调。风速比航空凤洞低。
In order to simulate boundary layer in atmosphere, the length of first test section is longer than usual one, the models are put into the rear part.
为了纪念对模具图纸的边界内的每洞的位置，同时，要求工人在钻洞，每马克，所以我们可以保证，所有孔对齐。
To mark the positions of holes per drawings on borders of molds, meanwhile, require worker to drill holes per marks, so we can assure that all holes are alignment.
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