棱柱（体），角柱（体）多面固体，上下两底面大小、形状相同，且彼此平行，其余诸面则为平行四边形。
A solid figure whose bases or ends have the same size and shape and are parallel to one another and each of whose sides is a parallelogram.
块石形状应接近直棱柱体，或有规则的四边形或多边形。
The shape of block stones shall be close to straight prism or regular quad or polygons.
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