Steinmetz solid
- 牟合方盖（牟合方盖是两个等半径圆柱在平面上垂直相交的公共部分，形似两个方形盖子合在一起）
Steinmetz solid
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abstract:
In geometry, the Steinmetz solid is the solid body generated by the intersection of two or three cylinders of equal radius at right angles. It is named after Charles Proteus Steinmetz, though these solids were known long before Steinmetz studied them.
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WordNet