有四个等边三角形面的四面体。
因此在空间中是一个三角形，空间中是一个四面体，等等。
一个完满的理论必须能够解释甲烷中为什么所有hch角都具有四面体的特性值。
A satisfactory theory must be able to explain why in methane the HCH angles all have the characteristic tetrahedral value.
算法首先对原始三角网格构造一个累进网格，把三角网格简化成最简单的形式，四面体。
The algorithm first construct a progressive mesh based on the source mesh and change the mesh into the simplest form, tetrahedron.
在晶体中观察到多个层错和一个由两个层错三角形组成的层错四面体。
Several stacking faults and a tetrahedron composed of two stacking faults in triangular were observed within the crystal.
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.
相对于三角形网格，四面体网格质量差的单元所占的比例更大、严重变形的单元更多。
Compared with triangular meshes, tetrahedral meshes tend to have a larger proportion of poor quality elements and to have elements that are more severely distorted.
提出一种基于四面体胞的尽可能刚性三角形网格变形算法。
In this paper, we introduce a novel approach to as-rigid-as-possible mesh deformation based on tetrahedral cells.
提出一种基于四面体胞的尽可能刚性三角形网格变形算法。
In this paper, we introduce a novel approach to as-rigid-as-possible mesh deformation based on tetrahedral cells.
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