| 1. | Only a fraction of the a ions are in tetrahedral sites .
只有一部分A离子处在四面体的位置上。 |
| 2. | In a similar way, a three-dimensional truss can be built up of tetrahedra .
采用类似的疗法，空间架可以由四面体构成。 |
| 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 two banana bonds start out from each carbon at roughly the tetrahedral angle .
这两个香蕉键是从每个碳原子以接近四面体角发出的。 |
| 5. | 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。 |
| 6. | It will be noted that between the two layers there exist interstices of two types: tetrahedral and octahedral .
要注意两层之间有两种类型的空隙：四面体型和八面体型。 |
| 7. | A satisfactory theory must be able to explain why in methane the hch angles all have the characteristic tetrahedral value .
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。 |
| 8. | These silicate tetrahedrons join into chains
这些硅酸盐四面体缠结成链状。 |
| 9. | Only a fraction of the a ions are in tetrahedral sites
只有一部分a离子处在四面体的位置上。 |
| 10. | The internal structure of silica has a pyramid ( tetrahedron ) unit
硅的内部结构是一个四面体。 |
