正四面体是由四个全等正三角形围成的空间封闭图形，所有棱长都相等。它有4个面，6条棱，4个顶点。正四面体是最简单的正多面体。
网络释义专业释义
双语例句原声例句
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在蒲丰投针问题的基础上，把投掷物由一维的针推广到二维的凸曲线，三维的正四面体、正六面体；
This paper tries to generalize the throwing objects from the one dimension pin to the convex curve in two dimension, and even the three dimensional regular tetrahedron and regular hexahedron .
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提出了利用正四面体的某些截面表示一定组成，得出相分离曲线和相分离曲面，并能较好地描述四元体系。
Some of the cross sections are used to stand for a certain component, and semiternary phase diagrams are ploted, then a quaternary phase diagram shown in a tetrahedron is obtained.
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文中导出了正方排列和正三角梭锥（正四面体）排列两种型式的三维（立体）声系统作为这组公式应用之例。
At last, the cases of three dimensional surrounding sound systems with cube array and triangular pyramid array models by using these formulas are illustrated for example in this paper.
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And so now I have hydrogens at the four corners of a tetrahedron.
放在碳正四面体,的四个角上。
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$firstVoiceSent
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