1·This paper proposes an algorithm to divide an arbitrary polyhedron to tetrahedrons and gives its theoretical basis, data type and implementation.
本文提出了一种将任意多面体剖分为四面体的算法，给出了算法理论基础的证明、算法具体实现步骤及所用数据结构。
2·The revetment is made up of many single permeable tetrahedrons, and has much gap, so the group of permeable tetrahedrons can be treat as the porous media with large porosity.
四面体透水框架群是由很多单个四面体框架抛投而成，具有很大的空隙，因而，可以将框架群看成由很多框架杆件和大的孔隙组成的大孔隙率多孔介质。
3·Every simple polyhedron is further divided into tetrahedrons.
每个简单多面体进一步剖分为四面体。
4·Even after ice melts, some of those tetrahedrons almost always remain, like tiny ice cubes 100 molecules wide.
即使在冰融化后，也几乎总会残留一些这种四面体，如100个分子那么宽的微小冰立方体。