Effective valences of copper in superconducting oxides were calculated from the concept of bondvalence.
从键价的概念出发，对氧化物超导体中铜离子的有效电荷进行了计算。
2
So, we can think about now how do we describe this bond in valencebond theory.
我们现在可以考虑，怎么在价电子成键理论中描述这个键。
3
So, using our simple valencebond theory, what we would expect is that we want to pair up any unpaired electrons in methane with unpaired electrons from hydrogen and form bonds.