三角形的九点圆 [数] nine-point circle of a triangle
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虚的部分是一些建筑分隔，比如填充墙、栏杆、阳台、加建部分，材料用的是镂空铝板，其纹样就是九角星的多样组合。
The imaginary part is some construction space, such as the filler wall, railing, balcony, build parts, materials with hollow aluminum plate, various combination of the pattern is nine star.
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