pyramid

/ˈpɪrəmɪd/

a polyhedron having a polygonal base and triangular sides with a common vertex

中文释义：金字塔；棱锥体

The ancient pyramids in Egypt attract millions of tourists every year.

埃及的古金字塔每年吸引数百万游客。

A pyramid has a square base and four triangular faces.

棱锥体有一个方形底面和四个三角形面。