tetrahedron

tetra-,四，-hed,座位，面，词源同 seat,polyhedron.

tetrahedron (n.)

"triangular pyramid, solid figure contained by four triangular surfaces," 1560s, from Late Greek tetraedron, noun use of neuter of tetraedros (adj.) "four-sided," from tetra- "four" (see tetra-) + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary). Related: Tetrahedral.

1. The center of inscribed circle of tetrahedron is called incenter.

四面体内切球的球心称为四面体的内心。

2. We can now use tetrahedron and hexahedron elements in three - dimensional stress analysis.

我们现在在三维应力分析中采用四面体单元和六面体单元.

3. Each tetrahedron shares two of its oxygens with neighboring tetrahedra.

每个四面体都有两个氧原子是与其相邻的两个四面体共用的.

4. The Rubik's is a toy in the shape of a tetrahedron.

魔方是个四面体的玩具.

5. A new bank - protection technology using tetrahedron - like penetrating frame groups is introduced.

介绍一种新型护岸技术 ― ―四面六边透水框架群护岸.