四棱锥是指由四个三角形和一个四边形构成的空间封闭图形，而正四棱锥，则是底面为正方形，四个三角形为全等三角形而且是等腰三角形。
四是数学能力系统。作者借助一个三棱锥图形，加深了对这些系统之间及其内部各要素之间关联性的认识和理解。
Whith the help of a triangular pyramid drawing, we are able to accelerate our understanding of the cognate interrelationship between the above systems and even between their internal basic elements.
四是数学能力系统。作者借助一个三棱锥图形，加深了对这些系统之间及其内部各要素之间关联性的认识和理解。
Whith the help of a triangular pyramid drawing, we are able to accelerate our understanding of the cognate interrelationship between the above systems and even between their internal basic ele…
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