For example, both crystalline and glassy forms of silica (SiO,) have structures with each si surrounded by four oxygen atoms, and each o by two si.

例如，晶体二氧化硅和石英结构的二氧化硅是每个硅原子被四个氧原子所包围，每个氧原子周围有两个硅原子。

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For example, both crystalline and glassy forms of silica (SiO,) have structures with each si surrounded by four oxygen atoms, and each o by two si.

例如，晶体二氧化硅和石英结构的二氧化硅是每个硅原子被四个氧原子所包围，每个氧原子周围有两个硅原子。

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