新手一枚，看文献中看到two fourfold coordinated Cooct（Oct上标） cations in the octahedral sites, two twofold coordinated (O2f) and two threefold coordinated (O3f) oxygen anions are exposed in the outermost surface。
请教大神： Cooct（Oct上标），Cotet(tet上标)， O2f（2f上标），O3f（3f上标）到底是什么意思呢？顺便能翻译下这句话吗？？？？
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