Silica structure is based on a tetrahedral arrangement of a silica atom bonded to oxygen atoms.

它的基本结是由一个硅原子与个氧原子，一个体。

Its molecules form tetrahedral shapes — that's a triangular pyramid, or a d4 if you're into tabletop RPGs.

它的分子结合体形——这是一种三形的棱锥，或者是色扮演游戏中的d4。

Over 160 kilometers beneath the Earth's surface, the intense heat and pressure forced carbon atoms into that tetrahedral structure to form diamonds.

在距离地表160多千米深处，高温高压使碳原子们形为体结，再进一步形钻石。

Phosphate is made up of one central phosphorus atom surrounded by four oxygen atoms in a tetrahedral arrangement, like a mini pyramid, and has a charge of minus 3 and is written PO43-.

磷酸盐由一个位于中心的磷原子和个氧原子组，呈体结，像一个小金字塔，电荷为-3，写PO43-。