The children built a pyramid out of blocks during their geometry lesson.

pyramid 来自希腊语 pyramis，指"金字塔"，是一种底面为正方形、四个侧面为三角形的立体几何形状。在古埃及文化中特指法老的陵墓建筑，现代也用来指代类似形状的物体或结构。