名词
中文翻译：Unknown
同义词：
['tetrahedron', 'tetragonal']
例句：
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1. The tetrahedron is a shape with four equal sides and four right angles.
四面体是一个具有四个相等边和四个直角的形状。
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2. The tetrahedron has a unique structure that makes it stable and strong.
四面体有一个独特的结构，使其稳定且坚固。
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3. In geometry, the tetrahedron is used to represent a regular polyhedron.
在几何学中，四面体用来表示一个规则多面体。