面心立方结构除顶角上有原子外，在立方体六个面的中心处还有6个原子，面心处原子与顶角处原子周围的情况相同，每个面为两个相邻的晶胞所共有，面心立方的晶胞具有4个原子。

In addition to the atoms at the top corner, there are 6 atoms at the center of the six faces of the cube, and the atoms at the center of the face are the same as around the atoms at the top corner, and each face is shared by two adjacent unit cells, and the unit cells of the face-centered cube have 4 atoms.