所屬欄目:礦物學(xué)專業(yè)術(shù)語(yǔ)
Definition: An n-gonal bipyramid or dipyramid is a polyhedron formed by joining an ngonal pyramid and its mirror image base-to-base. The referenced n-gon in the name of thebipyramids is not an external face but an internal one,existing on the primary symm ......(本文共 736 字 ) [閱讀本文] >>