We were moving over grey rocks of dense and massive formation, which in cooling had formed into hexagonal prisms.
我们在密集而巨大的灰色岩石上移动，这些岩石在冷却时形成了六角棱柱。
Hexagonal prism
原声例句
地心游记-The journey to the heart of the Earth
中文百科
六角柱
在几何学中，六角柱是一种多面体，是柱体的一种，是指底面是六边形的柱体。所有六角柱都有8个面，18个边和12个顶点。
由于它具有8个面，所以它是一个八面体。然而，“八面体”这个几何术语，主要是指正八面体，其中有8个三角形面。这个若称做八面体的话，会和正八面体混淆，所以很少使用“八面体”来表示六角柱。
英语百科
Hexagonal prism 六角柱
In geometry, the hexagonal prism is a prism with hexagonal base. This polyhedron has 8 faces, 18 edges, and 12 vertices.
Since it has eight faces, it is an octahedron. However, the term octahedron is primarily used to refer to the regular octahedron, which has eight triangular faces. Because of the ambiguity of the term octahedron and the dissimilarity of the various eight-sided figures, the term is rarely used without clarification.
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