"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.
实用例句
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。来自辞典例句
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.来自辞典例句
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.来自辞典例句
4. The Rubik's is a toy in the shape of a tetrahedron.
魔方是个四面体的玩具.来自互联网
5. A new bank - protection technology using tetrahedron - like penetrating frame groups is introduced.
